# Mail::Sender - phpMan

## NAME
    [Mail::Sender] - module for sending mails with attachments through an SMTP
    server

    Version 0.8.16

## SYNOPSIS
     use [Mail::Sender];
     $sender = new [Mail::Sender]
      {smtp => 'mail.yourdomain.com', from => '<your@address.com>'};
     $sender->MailFile({to => '<some@address.com>',
      subject => 'Here is the file',
      msg => "I'm sending you the list you wanted.",
      file => 'filename.txt'});

## DESCRIPTION
    "[Mail::Sender]" provides an object oriented interface to sending mails.
    It doesn't need any outer program. It connects to a mail server directly
    from Perl, using Socket.

    Sends mails directly from Perl through a socket connection.

new [Mail::Sender]
     new [Mail::Sender] ([from [,replyto [,to [,smtp [,subject [,headers [,boundary]]]]]]])
     new [Mail::Sender] {[from => '<somebody@somewhere.com>'] , [to => '<else@nowhere.com>'] [...]}

    Prepares a sender. This doesn't start any connection to the server. You
    have to use "$Sender-"Open> or "$Sender-"OpenMultipart> to start talking
    to the server.

    The parameters are used in subsequent calls to "$Sender-"Open> and
    "$Sender-"OpenMultipart>. Each such call changes the saved variables.
    You can set "smtp", "from" and other options here and then use the info
    in all messages.

  Parameters
    from
        ""=> the sender's e-mail address

    fake_from
        ""=> the address that will be shown in headers.

        If not specified we use the value of "from".

    replyto
        ""=> the reply-to address

    to  ""=> the recipient's address(es)

        This parameter may be either a comma separated list of email
        addresses or a reference to a list of addresses.

    fake_to
        ""=> the recipient's address that will be shown in headers. If not
        specified we use the value of "to".

        If the list of addresses you want to send your message to is long or
        if you do not want the recipients to see each other's address set
        the "fake_to" parameter to some informative, yet bogus, address or
        to the address of your mailing/distribution list.

    cc  ""=> address(es) to send a copy (CC:) to

    fake_cc
        ""=> the address that will be shown in headers.

        If not specified we use the value of "cc".

    bcc ""=> address(es) to send a copy (BCC: or blind carbon copy). these
        addresses will not be visible in the mail!

    smtp
        ""=> the IP or domain address of your SMTP (mail) server

        This is the name of your LOCAL mail server, do NOT try to contact
        directly the adressee's mailserver! That would be slow and buggy,
        your script should only pass the messages to the nearest mail server
        and leave the rest to it. Keep in mind that the recipient's server
        may be down temporarily.

    port
        ""=> the TCP/IP port used form the connection. By default
        getservbyname('smtp', 'tcp')||25. You should only need to use this
        option if your mail server waits on a nonstandard port.

    subject
        ""=> the subject of the message

    headers
        ""=> the additional headers

        You may use this parameter to add custon headers into the message.
        The parameter may be either a string containing the headers in the
        right format or a hash containing the headers and their values.

    boundary
        ""=> the message boundary

        You usualy do not have to change this, it might only come in handy
        if you need to attach a multipart mail created by [Mail::Sender] to
        your message as a single part. Even in that case any problems are
        unlikely.

    multipart
        ""=> the MIME subtype for the whole message
        (Mixed/Related/Alternative)

        You may need to change this setting if you want to send a HTML body
        with some inline images, or if you want to post the message in plain
        text as well as HTML (alternative). See the examples at the end of
        the docs. You may also use the nickname "subtype".

        Please keep in mind though that it's not currently possible to
        create nested parts with [Mail::Sender]. If you need that level of
        control you should try [MIME::Lite].

    ctype
        ""=> the content type of a single part message

        Please do not confuse these two. The 'multipart' parameter is used
        to specify the overall content type of a multipart message (for
        example a HTML document with inlined images) while ctype is an
        ordinary content type for a single part message. For example a HTML
        mail message without any inlines.

    encoding
        ""=> encoding of a single part message or the body of a multipart
        message.

        If the text of the message contains some extended characters or very
        long lines you should use 'encoding => "Quoted-printable"' in the
        call to Open(), OpenMultipart(), MailMsg() or MailFile().

        Keep in mind that if you use some encoding you should either use
        SendEnc() or encode the data yourself !

    charset
        ""=> the charset of the message

    client
        ""=> the name of the client computer.

        During the connection you send the mailserver your computer's name.
        By default [Mail::Sender] sends "(gethostbyname 'localhost')[0]". If
        that is not the address you need, you can specify a different one.

    priority
        ""=> the message priority number

        1 = highest, 2 = high, 3 = normal, 4 = low, 5 = lowest

    confirm
        ""=> whether you request reading or delivery confirmations and to
        what addresses:

                "delivery" - only delivery, to the C<from> address
                "reading" - only reading, to the C<from> address
                "delivery, reading" - both confirmations, to the C<from> address
                "delivery: <my.other@address.com>" - only delivery, to <my.other@address.com>
                ...

        Keep in mind though that neither of those is guaranteed to work.
        Some servers/mail clients do not support this feature and some
        users/admins may have disabled it. So it's possible that your mail
        was delivered and read, but you wount get any confirmation!

    ESMPT
                ESMTP => {
                        NOTIFY => 'SUCCESS,FAILURE,DELAY',
                        RET => 'HDRS',
                        ORCPT => 'rfc822;<my.other@address.com>',
                        ENVID => 'iuhsdfobwoe8t237',
                }

        This option contains data for SMTP extensions, for example it allows
        you to request delivery status notifications according to RFC1891.

        NOTIFY - to specify the conditions under which a delivery status
        notification should be generated. Should be either "NEVER" or a
        comma separated list of "SUCCESS", "FAILURE" and "DELAY".

        ORCPT - used to convey the "original" (sender-specified) recipient
        address

        RET - to request that Delivery Status Notifications containing an
        indication of delivery failure either return the entire contents of
        a message or only the message headers. Must be either FULL or HDRS

        ENVID - used to propagate an identifier for this message
        transmission envelope, which is also known to the sender and will,
        if present, be returned in any Delivery Status Notifications issued
        for this transmission

        You do not need to worry about encoding the ORCPT or ENVID
        parameters.

        If the SMTP server you connect to doesn't support this extension,
        the options will be ignored.

    debug
        ""=> "/path/to/debug/file.txt"

        or

        ""=> \*FILEHANDLE

        or

        ""=> $FH

        All the conversation with the server will be logged to that file or
        handle. All lines in the file should end with CRLF (the Windows and
        Internet format). If even a single one of them does not, please let
        me know!

        If you pass the path to the log file, [Mail::Sender] will overwrite
        it. If you want to append to the file, you have to open it yourself
        and pass the filehandle:

                open my $DEBUG, ">> /path/to/debug/file.txt"
                        or die "Can't open the debug file: $!\n"
                $sender = new [Mail::Sender] ({
                        ...
                        debug => $DEBUG,
                });

    debug_level
        Only taken into account if the "debug" option is specified.

                1 - only log the conversation with the server, skip all message data
                2 - log the conversation and message headers
                3 - log the conversation and the message and part headers
                4 - log everything (default)

    auth
        the SMTP authentication protocol to use to login to the server
        currently the only ones supported are LOGIN, PLAIN, CRAM-MD5 and
        NTLM.

        Some protocols have module dependencies. CRAM-MD5 depends on
        [Digest::HMAC_MD5] and NTLM on [Authen::NTLM].

        You may add support for other authentication protocols yourself. See
        below.

    authid
        the username used to login to the server

    authpwd
        the password used to login to the server

    authdomain
        the domain name. Used optionaly by the NTLM authentication.

        Other authentication protocols may use other options as well. They
        should all start with "auth" though.

        Please see the authentication section bellow.

    auth_encoded
        If set to a true value the LOGIN authentication assumes the authid
        and authpwd is already base64 encoded.

    keepconnection
        If set to a true value causes the [Mail::Sender] to keep the
        connection open for several messages. The connection will be closed
        if you call the Close() method with a true value or if you call
        Open, OpenMultipart, MailMsg or MailFile with the "smtp" parameter.
        This means that if you want the object to keep the connection you
        should pass the "smtp" either to "new [Mail::Sender]" or only to the
        first Open, OpenMultipart, MailMsg or MailFile!

    skip_bad_recipients
        If this option is set to false or not specified then [Mail::Sender]
        stops trying to send a message as soon as the first recipient's
        address fails. If it is set to a true value [Mail::Sender] skips the
        bad addresses and tries to send the message at least to the good
        ones. If all addresses are rejected by the server it reports an "All
        recipients were rejected" message.

        If any addresses were skipped the "$sender->{'skipped_recipients'}"
        will be a reference to a hash containing the failed address and the
        server's response.

    createmessageid
        This option allows you to overwrite the function that generates the
        message IDs for the emails. The function gets the "pure" sender's
        address as it's only parameter and is supposed to return a string.
        See the MessageID subroutine in [Mail::Sender].pm.

        If you want to specify a message id you can also use the "messageid"
        parameter for the Open, OpenMultipart, MailMsg or MailFile methods.

    on_errors
        This option allows you to affect the way [Mail::Sender] reports
        errors.

                => 'die' - raise an exception
                => 'code' - return the negative error code (default)
                => 'undef' - return an undef

        $[Mail::Sender::Error], $sender->{'error'} and $sender->{'error_msg'}
        are set in all the cases.

        All methods return the $sender object if they succeed.

        P.S.: The die_on_errors option is deprecated. You may still use it,
        but it may be removed in future versions!

  Return codes
      ref to a [Mail::Sender] object =  success

      -1 = $smtphost unknown
      -2 = socket() failed
      -3 = connect() failed
      -4 = service not available
      -5 = unspecified communication error
      -6 = local user $to unknown on host $smtp
      -7 = transmission of message failed
      -8 = argument $to empty
      -9 = no message specified in call to MailMsg or MailFile
      -10 = no file name specified in call to SendFile or MailFile
      -11 = file not found
      -12 = not available in singlepart mode
      -13 = site specific error
      -14 = connection not established. Did you mean MailFile instead of SendFile?
      -15 = no SMTP server specified
      -16 = no From: address specified
      -17 = authentication protocol not accepted by the server
      -18 = login not accepted
      -19 = authentication protocol is not implemented

    $[Mail::Sender::Error] contains a textual description of last error.

## METHODS
  Open
     Open([from [, replyto [, to [, smtp [, subject [, headers]]]]]])
     Open({[from => "<somebody@somewhere.com>"] , [to => "<else@nowhere.com>"] [...]})

    Opens a new message. If some parameters are unspecified or empty, it
    uses the parameters passed to the ""$Sender=new [Mail::Sender](...)"";

    See "new [Mail::Sender]" for info about the parameters.

    The only additional parameter that may not be specified directly in the
    "new [Mail::Sender]" is messageid. If you set this option then the message
    will be sent with this Message-ID, otherwise a new Message ID will be
    generated out of the sender's address, current date+time and a random
    number (or by the function you specified in the "createmessageid"
    option).

    After the message is sent "$sender-<{messageid}" will contain the
    Message-ID with which the message was sent.

    Returns ref to the [Mail::Sender] object if successfull.

  OpenMultipart
     OpenMultipart([from [, replyto [, to [, smtp [, subject [, headers [, boundary]]]]]]])
     OpenMultipart({[from => "<somebody@somewhere.com>"] , [to => "<else@nowhere.com>"] [...]})

    Opens a multipart message. If some parameters are unspecified or empty,
    it uses the parameters passed to the "$Sender=new [Mail::Sender](...)".

    See "new [Mail::Sender]" for info about the parameters.

    Returns ref to the [Mail::Sender] object if successfull.

  MailMsg
     MailMsg([from [, replyto [, to [, smtp [, subject [, headers]]]]]], message)
     MailMsg({[from => "<somebody@somewhere.com>"]
              [, to => "<else@nowhere.com>"] [...], msg => "Message"})

    Sends a message. If a mail in $sender is opened it gets closed and a new
    mail is created and sent. $sender is then closed. If some parameters are
    unspecified or empty, it uses the parameters passed to the ""$Sender=new
    [Mail::Sender](...)"";

    See "new [Mail::Sender]" for info about the parameters.

    The module was made so that you could create an object initialized with
    all the necesary options and then send several messages without need to
    specify the SMTP server and others each time. If you need to send only
    one mail using MailMsg() or MailFile() you do not have to create a named
    object and then call the method. You may do it like this :

     (new [Mail::Sender])->MailMsg({smtp => 'mail.company.com', ...});

    Returns ref to the [Mail::Sender] object if successfull.

  MailFile
     MailFile([from [, replyto [, to [, smtp [, subject [, headers]]]]]], message, file(s))
     MailFile({[from => "<somebody@somewhere.com>"]
               [, to => "<else@nowhere.com>"] [...],
               msg => "Message", file => "File"})

    Sends one or more files by mail. If a mail in $sender is opened it gets
    closed and a new mail is created and sent. $sender is then closed. If
    some parameters are unspecified or empty, it uses the parameters passed
    to the ""$Sender=new [Mail::Sender](...)"";

    The "file" parameter may be a "filename", a "list, of, file, names" or a
    \@list_of_file_names.

    see "new [Mail::Sender]" for info about the parameters.

    Just keep in mind that parameters like ctype, charset and encoding will
    be used for the attached file, not the body of the message. If you want
    to specify those parameters for the body you have to use b_ctype,
    b_charset and b_encoding. Sorry.

    Returns ref to the [Mail::Sender] object if successfull.

  Send
     Send(@strings)

    Prints the strings to the socket. Doesn't add any end-of-line
    characters. Doesn't encode the data! You should use "\r\n" as the
    end-of-line!

    UNLESS YOU ARE ABSOLUTELY SURE YOU KNOW WHAT YOU ARE DOING YOU SHOULD
    USE SendEnc() INSTEAD!

    Returns the object if successfull.

  SendLine
     SendLine(@strings)

    Prints the strings to the socket. Adds the end-of-line character at the
    end. Doesn't encode the data! You should use "\r\n" as the end-of-line!

    UNLESS YOU ARE ABSOLUTELY SURE YOU KNOW WHAT YOU ARE DOING YOU SHOULD
    USE SendLineEnc() INSTEAD!

    Returns the object if successfull.

  print
    Alias to SendEnc().

    Keep in mind that you can't write :

            print $sender "...";

    you have to use

            $sender->print("...");

    If you want to be able to print into the message as if it was a normal
    file handle take a look at "GetHandle"()

  SendEnc
     SendEnc(@strings)

    Prints the strings to the socket. Doesn't add any end-of-line
    characters.

    Encodes the text using the selected encoding
    (none/Base64/Quoted-printable)

    Returns the object if successfull.

  SendLineEnc
     SendLineEnc(@strings)

    Prints the strings to the socket and adds the end-of-line character at
    the end. Encodes the text using the selected encoding
    (none/Base64/Quoted-printable).

    Do NOT mix up /Send(Line)?(Ex)?/ and /Send(Line)?Enc/! SendEnc does some
    buffering necessary for correct Base64 encoding, and /Send(Ex)?/ is not
    aware of that!

    Usage of /Send(Line)?(Ex)?/ in non xBIT parts not recommended. Using
    "Send(encode_base64($string))" may work, but more likely it will not! In
    particular if you use several such to create one part, the data is very
    likely to get crippled.

    Returns the object if successfull.

  SendEx
     SendEx(@strings)

    Prints the strings to the socket. Doesn't add any end-of-line
    characters. Changes all end-of-lines to "\r\n". Doesn't encode the data!

    UNLESS YOU ARE ABSOLUTELY SURE YOU KNOW WHAT YOU ARE DOING YOU SHOULD
    USE SendEnc() INSTEAD!

    Returns the object if successfull.

  SendLineEx
     SendLineEx(@strings)

    Prints the strings to the socket. Adds an end-of-line character at the
    end. Changes all end-of-lines to "\r\n". Doesn't encode the data!

    UNLESS YOU ARE ABSOLUTELY SURE YOU KNOW WHAT YOU ARE DOING YOU SHOULD
    USE SendEnc() INSTEAD!

    Returns the object if successfull.

  Part
     Part( I<description>, I<ctype>, I<encoding>, I<disposition> [, I<content_id> [, I<msg>]]);
     Part( {[description => "desc"], [ctype => "content-type"], [encoding => "..."],
         [disposition => "..."], [content_id => "..."], [msg => ...]});

    Prints a part header for the multipart message and (if specified) the
    contents. The undefined or empty variables are ignored.

    description
      The title for this part.

    ctype
      the content type (MIME type) of this part. May contain some other
      parameters, such as charset or name.

      Defaults to "application/octet-stream".

      Since 0.8.00 you may use even "multipart/..." types. Such a multipart
      part should be closed by a call to $sender->EndPart($ctype).

              ...
              $sender->Part({ctype => "multipart/related", ...});
                      $sender->Part({ctype => 'text/html', ...});
                      $sender->Attach({file => 'some_image.gif', content_id => 'foo', ...});
              $sender->EndPart("multipart/related");
              ...

      Please see the examples below.

    encoding
      the encoding used for this part of message. Eg. Base64, Uuencode, 7BIT
      ...

      Defaults to "7BIT".

    disposition
      This parts disposition. Eg: 'attachment; filename="send.pl"'.

      Defaults to "attachment". If you specify "none" or "", the
      Content-disposition: line will not be included in the headers.

    content_id
      The content id of the part, used in multipart/related. If not
      specified, the header is not included.

    msg
      The content of the part. You do not have to specify the content here,
      you may use SendEnc() to add content to the part.

    charset
      The charset of the part.

    Returns the [Mail::Sender] object if successfull, negative error code if
    not.

  Body
     Body([charset [, encoding [, content-type]]]);
     Body({charset => '...', encoding => '...', ctype => '...', msg => '...');

    Sends the head of the multipart message body. You can specify the
    charset and the encoding. Default is "US-ASCII","7BIT",'text/plain'.

    If you pass undef or zero as the parameter, this function uses the
    default value:

        Body(0,0,'text/html');

    Returns the [Mail::Sender] object if successfull, negative error code if
    not. You should NOT use this method in single part messages, that is, it
    works after OpenMultipart(), but has no meaning after Open()!

  SendFile
    Alias to Attach()

  Attach
     Attach( I<description>, I<ctype>, I<encoding>, I<disposition>, I<file>);
     Attach( { [description => "desc"] , [ctype => "ctype"], [encoding => "encoding"],
                 [disposition => "disposition"], file => "file"});

     Sends a file as a separate part of the mail message. Only in multipart mode.

    description
      The title for this part.

    ctype
      the content type (MIME type) of this part. May contain some other
      parameters, such as charset or name.

      Defaults to "application/octet-stream".

    encoding
      the encoding used for this part of message. Eg. Base64, Uuencode, 7BIT
      ...

      Defaults to "Base64".

    disposition
      This parts disposition. Eg: 'attachment; filename="send.pl"'. If you
      use 'attachment; filename=*' the * will be replaced by the respective
      names of the sent files.

      Defaults to "attachment; filename=*". If you do not want to include
      this header use "" as the value.

    file
      The name of the file to send or a 'list, of, names' or a
      ['reference','to','a','list','of','filenames']. Each file will be sent
      as a separate part.

      Please keep in mind that if you pass a string as this parameter the
      module will split it on commas! If your filenames may contain commas
      and you want to be sure they are sent correctly you have to use the
      reference to array format:

              file => [ $filename],

    content_id
      The content id of the message part. Used in multipart/related.

       Special values:
        "*" => the name of the file
        "#" => autoincremented number (starting from 0)

    Returns the [Mail::Sender] object if successfull, negative error code if
    not.

  EndPart
     $sender->EndPart($ctype);

    Closes a multipart part.

    If the $ctype is not present or evaluates to false, only the current
    SIMPLE part is closed! Don't do that unless you are really sure you know
    what you are doing.

    It's best to always pass to the ->EndPart() the content type of the
    corresponding ->Part().

  Close
     $sender->Close;
     $sender->[Close(1)];

    Close and send the email message. If you pass a true value to the method
    the connection will be closed even if the "keepconnection" was
    specified. You should only keep the connection open if you plan to send
    another message immediately. And you should not keep it open for
    hundreds of emails even if you do send them all in a row.

    This method should be called automatically when destructing the object,
    but you should not rely on it. If you want to be sure your message WAS
    processed by the SMTP server you SHOULD call Close() explicitely.

    Returns the [Mail::Sender] object if successfull, negative error code if
    not, zero if $sender was not connected at all. The zero usualy means
    that the Open/OpenMultipart failed and you did not test its return
    value.

  Cancel
     $sender->Cancel;

    Cancel an opened message.

    SendFile and other methods may set $sender->{'error'}. In that case
    "undef $sender" calls "$sender-">Cancel not "$sender-">Close!!!

    Returns the [Mail::Sender] object if successfull, negative error code if
    not.

  QueryAuthProtocols
            @protocols = $sender->QueryAuthProtocols();
            @protocols = $sender->QueryAuthProtocols( $smtpserver);

    Queryies the server (specified either in the default options for
    [Mail::Sender], the "new [Mail::Sender]" command or as a parameter to this
    method for the authentication protocols it supports.

  GetHandle
    Returns a "filehandle" to which you can print the message or file to
    attach or whatever. The data you print to this handle will be encoded as
    necessary. Closing this handle closes either the message (for single
    part messages) or the part.

            $sender->Open({...});
            my $handle = $sender->GetHandle();
            print $handle "Hello world.\n"
            my ($mday,$mon,$year) = (localtime())[3,4,5];
            printf $handle "Today is %04d/%02d/%02d.", $year+1900, $mon+1, $mday;
            close $handle;

    P.S.: There is a big difference between the handle stored in
    $sender->{'socket'} and the handle returned by this function ! If you
    print something to $sender->{'socket'} it will be sent to the server
    without any modifications, encoding, escaping, ... You should NOT touch
    the $sender->{'socket'} unless you really really know what you are
    doing.

## FUNCTIONS
  GuessCType
            $ctype = GuessCType $filename, $filepath;

    Guesses the content type based on the filename or the file contents.
    This function is used when you attach a file and do not specify the
    content type. It is not exported by default!

    The builtin version uses the filename extension to guess the type.
    Currently there are only a few extensions defined, you may add other
    extensions this way:

            $[Mail::Sender::CTypes]{'EXT'} = 'content/type';
            ...

    The extension has to be in UPPERCASE and will be matched case
    sensitively.

    The package now includes two addins improving the guesswork. If you
    "use" one of them in your script, it replaces the builtin GuessCType()
    subroutine with a better one:

            [Mail::Sender::CType::Win32]
                    Win32 only, the content type is read from the registry
            [Mail::Sender::CType::Ext]
                    any OS, a longer list of extensions from A. Guillaume

  ResetGMTdiff
            ResetGMTdiff()

    The module computes the local vs. GMT time difference to include in the
    timestamps added into the message headers. As the time difference may
    change due to summer savings time changes you may want to reset the time
    difference ocassionaly in long running programs.

## CONFIG
    If you create a file named Sender.config in the same directory where
    Sender.pm resides, this file will be "require"d as soon as you "use
    [Mail::Sender]" in your script. Of course the Sender.config MUST "return a
    true value", that is it has to be succesfully compiled and the last
    statement must return a true value. You may use this to forbide the use
    of [Mail::Sender] to some users.

    You may define the default settings for new [Mail::Sender] objects and do
    a few more things.

    The default options are stored in hash %[Mail::Sender::default]. You may
    use all the options you'd use in "new", "Open", "OpenMultipart",
    "MailMsg" or "MailFile".

     Eg.
      %default = (
        smtp => 'mail.yourhost.cz',
        from => getlogin.'yourhost.cz',
        client => getlogin.'.yourhost.cz'
      );
      # of course you will use your own mail server here !

    The other options you may set here (or later of course) are
    $[Mail::Sender::SITE_HEADERS], $[Mail::Sender::NO_X_MAILER] and
    $[Mail::Sender::NO_DATE]. (These are plain old scalar variables, there is
    no function or method for modifying them. Just set them to anything you
    need.)

    The $[Mail::Sender::SITE_HEADERS] may contain headers that will be added
    to each mail message sent by this script, the $[Mail::Sender::NO_X_MAILER]
    disables the header item specifying that the message was sent by
    [Mail::Sender] and $[Mail::Sender::NO_DATE] turns off the Date: header
    generation.

    !!! $[Mail::Sender::SITE_HEADERS] may NEVER end with \r\n !!!

    If you want to set the $[Mail::Sender::SITE_HEADERS] for every script sent
    from your server without your users being able to change it you may use
    this hack:

     $loginname = something_that_identifies_the_user();
     *[Mail::Sender::SITE_HEADERS] = \"X-Sender: $loginname via $0";
     $[Mail::Sender::NO_X_MAILER] = 1;

    You may even "install" your custom function that will be evaluated for
    each message just before contacting the server. You may change all the
    options from within as well as stop sending the message.

    All you have to do is to create a function named SiteHook in
    [Mail::Sender] package. This function will get the [Mail::Sender] object as
    its first argument. If it returns a TRUE value the message is sent, if
    it returns FALSE the sending is canceled and the user gets "Site
    specific error" error message.

    If you want to give some better error message you may do it like this :

     sub SiteHook {
      my $self = shift;
      if (whatever($self)) {
        $self->Error( SITEERROR);
        $[Mail::Sender::Error] = "I don't like this mail";
        return 0
      } else {
        return 1;
      }
     }

    This example will ensure the from address is the users real address :

     sub SiteHook {
      my $self = shift;
      $self->{'fromaddr'} = getlogin.'@yoursite.com';
      $self->{'from'} = getlogin.'@yoursite.com';
      1;
     }

    Please note that at this stage the from address is in two different
    object properties.

    $self->{'from'} is the address as it will appear in the mail, that is it
    may include the full name of the user or any other comment ( "Jan
    Krynicky <<jenda@krynicky.cz>>" for example), while the
    $self->{'fromaddr'} is realy just the email address per se and it will
    be used in conversation with the SMTP server. It must be without
    comments ("<jenda@krynicky.cz>" for example)!

    Without write access to .../lib/Mail/Sender.pm or
    .../lib/Mail/Sender.config your users will then be unable to get rid of
    this header. Well ... everything is doable, if they are cheeky enough
    ... :-(

    So if you take care of some site with virtual servers for several
    clients and implement some policy via SiteHook() or
    $[Mail::Sender::SITE_HEADERS] search the clients' scripts for "SiteHook"
    and "SITE_HEADERS" from time to time. To see who's cheating.

## AUTHENTICATION
    If you get a "Local user "<xxx@yyy.com>" unknown on host "zzz"" message it
    usualy means that your mail server is set up to forbid mail relay. That
    is it only accepts messages to or from a local user. If you need to be
    able to send a message with both the sender's and recipient's address
    remote, you need to somehow authenticate to the server. You may need the
    help of the mail server's administrator to find out what username and
    password and/or what authentication protocol are you supposed to use.

    There are many authentication protocols defined for ESTMP, [Mail::Sender]
    natively supports only PLAIN, LOGIN, CRAM-MD5 and NTLM (please see the
    docs for "new [Mail::Sender]").

    If you want to know what protocols are supported by your server you may
    get the list by this:

            /tmp# perl -[MMail::Sender] -e '[Mail::Sender]->printAuthProtocols("the.server.com")'
      or
            c:\> perl -[MMail::Sender] -e "[Mail::Sender]->printAuthProtocols('the.server.com')"

    There is one more way to authenticate. Some servers want you to login by
    POP3 before you can send a message. You have to use [Net::POP3] or
    [Mail::POP3Client] to do this.

  Other protocols
    It is possible to add new authentication protocols to [Mail::Sender]. All
    you have to do is to define a function [Mail::Sender::Auth::PROTOCOL_NAME]
    that will implement the login. The function gets one parameter ... the
    [Mail::Sender] object. It can access these properties:

            $obj->{'socket'} : the socket to print to and read from
                    you may use the send_cmd() function to send a request
                    and read a response from the server
            $obj->{'authid'} : the username specified in the new [Mail::Sender],
                    Open or OpenMultipart call
            $obj->{'authpwd'} : the password
            $obj->{auth...} : all unknown parameters passed to the constructor or the mail
                    opening/creation methods are preserved in the object. If the protocol requires
                    any other options, please use names starting with "auth". Eg. "authdomain", ...
            $obj->{'error'} : this should be set to a negative error number. Please use numbers
                    below -1000 for custom errors.
            $obj->{'error_msg'} : this should be set to the error message

            If the login fails you should
                    1) Set $[Mail::Sender::Error] to the error message
                    2) Set $obj->{'error_msg'} to the error message
                    2) Set $obj->{'error'} to a negative number
                    3) return a negative number
            If it succeeds, please return "nothing" :
                    return;

    Please use the protocols defined within Sender.pm as examples.

## EXAMPLES
  Object creation
     ref ($sender = new [Mail::Sender] { from => '<somebody@somewhere.com>',
           smtp => 'mail.yourISP.com', boundary => 'This-is-a-mail-boundary-435427'})
     or die "Error in mailing : $[Mail::Sender::Error]\n";

    or

     my $sender = new [Mail::Sender] { ... };
     die "Error in mailing : $[Mail::Sender::Error]\n" unless ref $sender;

    or

     my $sender = new [Mail::Sender] { ..., on_errors => 'undef' }
       or die "Error in mailing : $[Mail::Sender::Error]\n";

    You may specify the options either when creating the [Mail::Sender] object
    or later when you open a message. You may also set the default options
    when installing the module (See "CONFIG" section). This way the admin
    may set the SMTP server and even the authentication options and the
    users do not have to specify it again.

    You should keep in mind that the way [Mail::Sender] reports failures
    depends on the 'on_errors'=> option. If you set it to 'die' it throws an
    exception, if you set it to "undef" or 'undef' it returns undef and
    otherwise it returns a negative error code!

  Simple single part message
            $sender = new [Mail::Sender] {
                    smtp => 'mail.yourISP.com',
                    from => '<somebody@somewhere.com>',
                    on_errors => undef,
            }
                    or die "Can't create the [Mail::Sender] object: $[Mail::Sender::Error]\n";
            $sender->Open({
                    to => '<mama@home.org>, <papa@work.com>',
                    cc => '<somebody@somewhere.com>',
                    subject => 'Sorry, I\'ll come later.'
            })
                    or die "Can't open the message: $sender->{'error_msg'}\n";
            $sender->SendLineEnc("I'm sorry, but thanks to the lusers,
                    I'll come at 10pm at best.");
            $sender->SendLineEnc("\nHi, Jenda");
            $sender->Close()
                    or die "Failed to send the message: $sender->{'error_msg'}\n";

    or

            eval {
                    $sender = new [Mail::Sender] {
                            smtp => 'mail.yourISP.com',
                            from => '<somebody@somewhere.com>',
                            on_errors => 'die',
                    };
                    $sender->Open({
                            to => '<mama@home.org>, <papa@work.com>',
                            cc => '<somebody@somewhere.com>',
                            subject => 'Sorry, I\'ll come later.'
                    });
                    $sender->SendLineEnc("I'm sorry, but thanks to the lusers,
                            I'll come at 10pm at best.");
                    $sender->SendLineEnc("\nHi, Jenda");
                    $sender->Close();
            };
            if ($@) {
                    die "Failed to send the message: $@\n";
            }

    or

            $sender = new [Mail::Sender] {
                    smtp => 'mail.yourISP.com',
                    from => '<somebody@somewhere.com>',
                    on_errors => 'code',
            };
            die "Can't create the [Mail::Sender] object: $[Mail::Sender::Error]\n"
                    unless ref $sender;
            ref $sender->Open({
                    to => '<mama@home.org>, <papa@work.com>',
                    cc => '<somebody@somewhere.com>',
                    subject => 'Sorry, I\'ll come later.'
            })
                    or die "Can't open the message: $sender->{'error_msg'}\n";
            $sender->SendLineEnc("I'm sorry, but thanks to the lusers,
                    I'll come at 10pm at best.");
            $sender->SendLineEnc("\nHi, Jenda");
            ref $sender->Close
                    or die "Failed to send the message: $sender->{'error_msg'}\n";

  Using GetHandle()
      ref $sender->Open({to => '<friend@other.com>', subject => 'Hello dear friend'})
             or die "Error: $[Mail::Sender::Error]\n";
      my $FH = $sender->GetHandle();
      print $FH "How are you?\n\n";
      print $FH <<'*END*';
      I've found these jokes.

       Doctor, I feel like a pack of cards.
       Sit down and I'll deal with you later.

       Doctor, I keep thinking I'm a dustbin.
       Don't talk rubbish.

      Hope you like'em. Jenda
      *END*

      $sender->Close;
      # or
      # close $FH;

    or

      eval {
        $sender->Open({ on_errors => 'die',
                             to => '<mama@home.org>, <papa@work.com>',
                    cc => '<somebody@somewhere.com>',
                    subject => 'Sorry, I\'ll come later.'});
        $sender->SendLineEnc("I'm sorry, but due to a big load of work,
      I'll come at 10pm at best.");
        $sender->SendLineEnc("\nHi, Jenda");
        $sender->Close;
      };
      if ($@) {
        print "Error sending the email: $@\n";
      } else {
        print "The mail was sent.\n";
      }

  Multipart message with attachment
     $sender->OpenMultipart({to => '<Perl-Win32-Users@activeware.foo>',
                             subject => '[Mail::Sender].pm - new module'});
     $sender->Body;
     $sender->SendEnc(<<'*END*');
     Here is a new module [Mail::Sender].
     It provides an object based interface to sending SMTP mails.
     It uses a direct socket connection, so it doesn't need any
     additional program.

     Enjoy, Jenda
     *END*
     $sender->Attach(
      {description => 'Perl module [Mail::Sender].pm',
       ctype => 'application/x-zip-encoded',
       encoding => 'Base64',
       disposition => 'attachment; filename="Sender.zip"; type="ZIP archive"',
       file => 'sender.zip'
      });
     $sender->Close;

    or

     $sender->OpenMultipart({to => '<Perl-Win32-Users@activeware.foo>',
                             subject => '[Mail::Sender].pm - new version'});
     $sender->Body({ msg => <<'*END*' });
     Here is a new module [Mail::Sender].
     It provides an object based interface to sending SMTP mails.
     It uses a direct socket connection, so it doesn't need any
     additional program.

     Enjoy, Jenda
     *END*
     $sender->Attach(
      {description => 'Perl module [Mail::Sender].pm',
       ctype => 'application/x-zip-encoded',
       encoding => 'Base64',
       disposition => 'attachment; filename="Sender.zip"; type="ZIP archive"',
       file => 'sender.zip'
      });
     $sender->Close;

    or (in case you have the file contents in a scalar)

     $sender->OpenMultipart({to => '<Perl-Win32-Users@activeware.foo>',
                             subject => '[Mail::Sender].pm - new version'});
     $sender->Body({ msg => <<'*END*' });
     Here is a new module [Mail::Sender].
     It provides an object based interface to sending SMTP mails.
     It uses a direct socket connection, so it doesn't need any
     additional program.

     Enjoy, Jenda
     *END*
     $sender->Part(
      {description => 'Perl module [Mail::Sender].pm',
       ctype => 'application/x-zip-encoded',
       encoding => 'Base64',
       disposition => 'attachment; filename="Sender.zip"; type="ZIP archive"',
       msg => $sender_zip_contents,
      });
     $sender->Close;

  Using exceptions (no need to test return values after each function)
     use [Mail::Sender];
     eval {
     (new [Mail::Sender] {on_errors => 'die'})
            ->OpenMultipart({smtp=> 'jenda.krynicky.cz', to => '<jenda@krynicky.cz>',subject => '[Mail::Sender].pm - new version'})
            ->Body({ msg => <<'*END*' })
     Here is a new module [Mail::Sender].
     It provides an object based interface to sending SMTP mails.
     It uses a direct socket connection, so it doesn't need any
     additional program.

     Enjoy, Jenda
     *END*
            ->Attach({
                    description => 'Perl module [Mail::Sender].pm',
                    ctype => 'application/x-zip-encoded',
                    encoding => 'Base64',
                    disposition => 'attachment; filename="Sender.zip"; type="ZIP archive"',
                    file => 'W:\jenda\packages\Mail\Sender\Mail-Sender-0.7.14.3.tar.gz'
            })
            ->Close();
     } or print "Error sending mail: $@\n";

  Using MailMsg() shortcut to send simple messages
    If everything you need is to send a simple message you may use:

     if (ref ($sender->MailMsg({to =>'<Jenda@Krynicky.czX>', subject => 'this is a test',
                             msg => "Hi Johnie.\nHow are you?"}))) {
      print "Mail sent OK."
     } else {
      die "$[Mail::Sender::Error]\n";
     }

    or

     if ($sender->MailMsg({
       smtp => 'mail.yourISP.com',
       from => '<somebody@somewhere.com>',
       to =>'<Jenda@Krynicky.czX>',
       subject => 'this is a test',
       msg => "Hi Johnie.\nHow are you?"
     }) < 0) {
      die "$[Mail::Sender::Error]\n";
     }
     print "Mail sent OK."

  Using MailMsg and authentication
     if ($sender->MailMsg({
       smtp => 'mail.yourISP.com',
       from => '<somebody@somewhere.com>',
       to =>'<Jenda@Krynicky.czX>',
       subject => 'this is a test',
       msg => "Hi Johnie.\nHow are you?"
       auth => 'NTLM',
       authid => 'jenda',
       authpwd => 'benda',
     }) < 0) {
      die "$[Mail::Sender::Error]\n";
     }
     print "Mail sent OK."

  Using MailFile() shortcut to send an attachment
    If you want to attach some files:

     (ref ($sender->MailFile(
      {to =>'<you@address.com>', subject => 'this is a test',
       msg => "Hi Johnie.\nI'm sending you the pictures you wanted.",
       file => 'image1.jpg,image2.jpg'
      }))
      and print "Mail sent OK."
     )
     or die "$[Mail::Sender::Error]\n";

  Sending HTML messages
    If you are sure the HTML doesn't contain any accentuated characters
    (with codes above 127).

     open IN, $htmlfile or die "Cannot open $htmlfile : $!\n";
     $sender->Open({ from => '<your@address.com>', to => '<other@address.com>',
            subject => 'HTML test',
            ctype => "text/html",
            encoding => "7bit"
     }) or die $[Mail::Sender::Error],"\n";

     while (<IN>) { $sender->SendEx($_) };
     close IN;
     $sender->Close();

    Otherwise use SendEnc() instead of SendEx() and "quoted-printable"
    instead of "7bit".

    Another ... quicker way ... would be:

     open IN, $htmlfile or die "Cannot open $htmlfile : $!\n";
     $sender->Open({ from => '<your@address.com>', to => '<other@address.com>',
            subject => 'HTML test',
            ctype => "text/html",
            encoding => "quoted-printable"
     }) or die $[Mail::Sender::Error],"\n";

     while (read IN, $buff, 4096) { $sender->SendEnc($buff) };
     close IN;
     $sender->Close();

  Sending HTML messages with inline images
            if (ref $sender->OpenMultipart({
                    from => '<someone@somewhere.net>', to => $recipients,
                    subject => 'Embedded Image Test',
                    boundary => 'boundary-test-1',
                    multipart => 'related'})) {
                    $sender->Attach(
                             {description => 'html body',
                             ctype => 'text/html; charset=us-ascii',
                             encoding => '7bit',
                             disposition => 'NONE',
                             file => 'test.html'
                    });
                    $sender->Attach({
                            description => 'ed\'s gif',
                            ctype => 'image/gif',
                            encoding => 'base64',
                            disposition => "inline; filename=\"apache_pb.gif\";\r\nContent-ID: <img1>",
                            file => 'apache_pb.gif'
                    });
                    $sender->Close() or die "Close failed! $[Mail::Sender::Error]\n";
            } else {
                    die "Cannot send mail: $[Mail::Sender::Error]\n";
            }

    And in the HTML you'll have this : ... <IMG src="cid:img1"> ... on the
    place where you want the inlined image.

    Please keep in mind that the image name is unimportant, it's the
    Content-ID what counts!

    # or using the eval{ $obj->Method()->Method()->...->Close()} trick ...

            use [Mail::Sender];
            eval {
            (new [Mail::Sender])
                    ->OpenMultipart({
                            to => '<someone@somewhere.com>',
                            subject => 'Embedded Image Test',
                            boundary => 'boundary-test-1',
                            type => 'multipart/related'
                    })
                    ->Attach({
                            description => 'html body',
                            ctype => 'text/html; charset=us-ascii',
                            encoding => '7bit',
                            disposition => 'NONE',
                            file => 'c:\temp\zk\HTMLTest.htm'
                    })
                    ->Attach({
                            description => 'Test gif',
                            ctype => 'image/gif',
                            encoding => 'base64',
                            disposition => "inline; filename=\"test.gif\";\r\nContent-ID: <img1>",
                            file => 'test.gif'
                    })
                    ->Close()
            }
            or die "Cannot send mail: $[Mail::Sender::Error]\n";

  Sending message with plaintext and HTML alternatives
            use [Mail::Sender];

            eval {
                    (new [Mail::Sender])
                    ->OpenMultipart({
                            to => '<someone@somewhere.com>',
                            subject => 'Alternatives',
            #               debug => 'c:\temp\zkMailFlow.log',
                            multipart => 'mixed',
                    })
                            ->Part({ctype => 'multipart/alternative'})
                                    ->Part({ ctype => 'text/plain', disposition => 'NONE', msg => <<'*END*' })
            A long
            mail
            message.
            *END*
                                    ->Part({ctype => 'text/html', disposition => 'NONE', msg => <<'*END*'})
            <html><body><h1>A long</h1><p align=center>
            mail
            message.
            </p></body></html>
            *END*
                            ->EndPart("multipart/alternative")
                    ->Close();
            } or print "Error sending mail: $[Mail::Sender::Error]\n";

  Sending message with plaintext and HTML alternatives with inline images
            use [Mail::Sender];

            eval {
                    (new [Mail::Sender])
                    ->OpenMultipart({
                            to => '<someone@somewhere.com>',
                            subject => 'Alternatives with images',
            #               debug => 'c:\temp\zkMailFlow.log',
                            multipart => 'related',
                    })
                            ->Part({ctype => 'multipart/alternative'})
                                    ->Part({ ctype => 'text/plain', disposition => 'NONE', msg => <<'*END*' })
            A long
            mail
            message.
            *END*
                                    ->Part({ctype => 'text/html', disposition => 'NONE', msg => <<'*END*'})
            <html><body><h1>A long</h1><p align=center>
            mail
            message.
            <img src="cid:img1">
            </p></body></html>
            *END*
                            ->EndPart("multipart/alternative")
                            ->Attach({
                                    description => 'ed\'s jpg',
                                    ctype => 'image/jpeg',
                                    encoding => 'base64',
                                    disposition => "inline; filename=\"0518m_b.jpg\";\r\nContent-ID: <img1>",
                                    file => 'E:\pix\humor\0518m_b.jpg'
                            })
                    ->Close();
            } or print "Error sending mail: $[Mail::Sender::Error]\n";

    Keep in mind please that different mail clients display messages
    differently. You may need to try several ways to create messages so that
    they appear the way you need. These two examples looked like I expected
    in Pegasus Email and MS Outlook.

    If this doesn't work with your mail client, please let me know and we
    might find a way.

  Sending a file that was just uploaded from an HTML form
     use CGI;
     use [Mail::Sender];

     $query = new CGI;

     # uploading the file...
     $filename = $query->param('mailformFile');
     if ($filename ne ""){
      $tmp_file = $query->tmpFileName($filename);
     }

     $sender = new [Mail::Sender] {from => '<script@krynicky.cz>',smtp => 'mail.krynicky.czX'};
     $sender->OpenMultipart({to=> '<jenda@krynicky.czX>',subject=> 'test CGI attach'});
     $sender->Body();
     $sender->Send(<<"*END*");
     This is just a test of mail with an uploaded file.

     Jenda
     *END*
     $sender->Attach({
        encoding => 'Base64',
        description => $filename,
        ctype => $query->uploadInfo($filename)->{'Content-Type'},
        disposition => "attachment; filename = $filename",
        file => $tmp_file
     });
     $sender->Close();

     print "Content-type: text/plain\n\nYes, it's sent\n\n";

  Listing the authentication protocols supported by the server
     use [Mail::Sender];
     my $sender = new [Mail::Sender] {smtp => 'localhost'};
     die "Error: $[Mail::Sender::Error]\n" unless ref $sender;
     print join(', ', $sender->QueryAuthProtocols()),"\n";

    or (if you have [Mail::Sender] 0.8.05 or newer)

     use [Mail::Sender];
     print join(', ', [Mail::Sender]->QueryAuthProtocols('localhost')),"\n";

    or

     use [Mail::Sender];
     print join(', ', [Mail::Sender::QueryAuthProtocols]('localhost')),"\n";

  FAQ
   Forwarding the messages created by [Mail::Sender] removes accents. Why?
    The most likely colprit is missing or incorrect charset specified for
    the body or a part of the email. You should add something like

            charset => 'iso-8859-1',
            encoding => 'quoted-printable',

    to the parameters passed to Open(), OpenMultipart(), MailMsg(), Body()
    or Part() or

            b_charset => 'iso-8859-1',
            b_encoding => 'quoted-printable',

    to the parameters for MailFile().

    If you use a different charset ('iso-8859-2', 'win-1250', ...) you will
    of course need to specify that charset. If you are not sure, try to send
    a mail with some other mail client and then look at the message/part
    headers.

  Sometimes there is an equals sign at the end of an attached file when
I open the email in Outlook. What's wrong?
    Outlook is. It has (had) a bug in its quoted printable decoding
    routines. This problem happens only in quoted-printable encoded parts on
    multipart messages. And only if the data in that part do not end with a
    newline. (This is new in 0.8.08, in older versions it happened in all QP
    encoded parts.)

    The problem is that an equals sign at the end of a line in a quoted
    printable encoded text means "ignore the newline". That is

            fooo sdfg sdfg sdfh dfh =
            dfsgdsfg

    should be decoded as

            fooo sdfg sdfg sdfh dfh dfsgdsfg

    The problem is at the very end of a file. The part boundary (text
    separating different parts of a multipart message) has to start on a new
    line, if the attached file ends by a newline everything is cool. If it
    doesn't I need to add a newline and to denote that the newline is not
    part of the original file I add an equals:

            dfgd dsfgh dfh dfh dfhdfhdfhdfgh
            this is the last line.=
            --message-boundary-146464--

    Otherwise I'd add a newline at the end of the file. If you do not care
    about the newline and want to be sure Outlook doesn't add the equals to
    the file add

            bypass_outlook_bug => 1

    parameter to "new [Mail::Sender]" or "Open"/"OpenMultipart".

  WARNING
    DO NOT mix Open(Multipart)|Send(Line)(Ex)|Close with MailMsg or
    MailFile. Both Mail(Msg/File) close any Open-ed mail. Do not try this:

     $sender = new [Mail::Sender] ...;
     $sender->OpenMultipart...;
     $sender->Body;
     $sender->Send("...");
     $sender->MailFile({file => 'something.ext');
     $sender->Close;

    This WON'T work!!!

  GOTCHAS
   Local user "<someone@somewhere.com>" doesn't exist
    "Thanks" to spammers mail servers usualy do not allow just anyone to
    post a message through them. Most often they require that either the
    sender or the recipient is local to the server

   [Mail::Sendmail] works, [Mail::Sender] doesn't
    If you are able to connect to the mail server and scripts using
    [Mail::Sendmail] work, but [Mail::Sender] fails with "connect() failed",
    please review the settings in /etc/services. The port for SMTP should be
    25.

   $/ and $\
    If you change the $/ ($RS, $INPUT_RECORD_SEPARATOR) or $\ ($ORS,
    $OUTPUT_RECORD_SEPARATOR) or $, ($OFS, $OUTPUT_FIELD_SEPARATOR)
    [Mail::Sender] may stop working! Keep in mind that those variables are
    global and therefore they change the behaviour of <> and print
    everywhere. And since the SMTP is a plain text protocol if you change
    the notion of lines you can break it.

    If you have to fiddle with $/, $\ or $, do it in the smallest possible
    block of code and local()ize the change!

            open my $IN, '<', $filename or die "Can't open $filename: $!\n";
            my $data = do {local $/; <$IN>};
            close $IN;

## BUGS
    I'm sure there are many. Please let me know if you find any.

    The problem with multiline responses from some SMTP servers (namely
    qmail) is solved. At last.

## SEE ALSO
    [MIME::Lite], [MIME::Entity], [Mail::Sendmail], [Mail::Mailer], ...

    There are lots of mail related modules on CPAN, with different
    capabilities and interfaces. You have to find the right one yourself :-)

## DISCLAIMER
    This module is based on SendMail.pm Version : 1.21 that appeared in
    <Perl-Win32-Users@activeware.com> mailing list. I don't remember the name
    of the poster and it's not mentioned in the script. Thank you mr.
    "undef".

## AUTHOR
    Jan Krynicky <<Jenda@Krynicky.cz>> <http://Jenda.Krynicky.cz>

    With help of Rodrigo Siqueira <<rodrigo@insite.com.br>>, Ed McGuigan
    <<itstech1@gate.net>>, John Sanche <<john@quadrant.net>>, Brian Blakley
    <<bblakley@mp5.net>>, and others.

## COPYRIGHT
    Copyright (c) 1997-2006 Jan Krynicky <<Jenda@Krynicky.cz>>. All rights
    reserved.

    This program is free software; you can redistribute it and/or modify it
    under the same terms as Perl itself. There is only one aditional
    condition, you may NOT use this module for SPAMing! NEVER! (see
    <http://spam.abuse.net/> for definition)

