# msgchk - man(1) - [phpMan]

[_MSGCHK_(1mh)](https://www.chedong.com/phpMan.php/man/MSGCHK/1mh/markdown)                                                                              [_MSGCHK_(1mh)](https://www.chedong.com/phpMan.php/man/MSGCHK/1mh/markdown)

## NAME
       msgchk - nmh's check for incoming email

## SYNOPSIS


       **msgchk **[**-help**] [**-version**] [**-date **| **-nodate**] [**-notify **all/mail/nomail ] [**-nonotify**
            all/mail/nomail ] [**-host **_hostname_] [**-port **_portname/number_] [**-user **_username_] [**-sasl **|
            **-nosasl**] [**-saslmech **_mechanism_] [**-tls**] [**-initialtls**] [**-notls**] [**-certverify **| **-nocertver‐**
            **ify**] [**-authservice **_service_] [**-snoop**] [_users_ ... ]

## DESCRIPTION
       The  **msgchk  **program  checks  all known mail drops for mail waiting for you.  For those drops
       which have mail for you, **msgchk **will indicate if it believes that you have seen the  mail  in
       question before.

       The  **-notify  **_type_ switch indicates under what circumstances **msgchk **should produce a message.
       The default is **-notify **_all_ which says that **msgchk **should always  report  the  status  of  the
       users mail drop.  Other values for `type' include `mail' which says that **msgchk **should report
       the  status of waiting mail; and, `nomail' which says that **msgchk **should report the status of
       empty mail drops.  The **-nonotify **_type_ switch has the inverted sense, so **-nonotify **_all_ directs
       **msgchk **to never report the status of mail drops.  This is useful if the user wishes to  check
       **msgchk**'s  exit  status.   A  non-zero  exit status indicates that mail was _not_ waiting for at
       least one of the indicated users.

       If **msgchk **produces output, then the **-date **switch directs **msgchk **to print out  the  last  date
       mail was read, if this can be determined.

### Using POP
       **msgchk  **will  normally check all the local mail drops, but if the option “pophost:” is set in
       the mts configuration file “mts.conf”, or if the **-host **_hostname_ switch is given, **msgchk  **will
       query this POP service host as to the status of mail waiting.  The **-port **switch specifies the
       port  name  or  number  used  to  connect  to the POP server.  If unspecified, the default is
       “pop3”.

       To specify a username for authentication with the POP server, use the **-user **_username_  switch.
       The  credentials  profile  entry in [_mh-profile_(5)](https://www.chedong.com/phpMan.php/man/mh-profile/5/markdown) describes the ways to supply a username and
       password.

       For debugging purposes, there is also a switch **-snoop**, which will allow you to watch the  POP
       transaction  take  place between you and the POP server.  If **-sasl -saslmech xoauth2 **is used,
       the HTTP transaction is also shown.

       If **nmh **has been compiled with SASL support, the **-sasl **switch will enable the use of SASL  au‐
       thentication.   Depending on the SASL mechanism used, this may require an additional password
       prompt from the user (but the _netrc_ file can be used to store this password, as described  in
       [_mh-profile_(5)](https://www.chedong.com/phpMan.php/man/mh-profile/5/markdown).  The **-saslmech **switch can be used to select a particular SASL mechanism.

       If  SASL  authentication is successful, **msgchk **will attempt to negotiate a security layer for
       session encryption.  Encrypted traffic is labelled with `(encrypted)' and `(decrypted)'  when
       viewing  the  POP transaction with the **-snoop **switch; see [_post_(8)](https://www.chedong.com/phpMan.php/man/post/8/markdown)'s description of **-snoop **for
       its other features.

       If **nmh **has been compiled with OAuth support, the **-sasl -saslmech xoauth2 **switch  will  enable
       OAuth  authentication.  The **-user **switch must be used, and the _user-name_ must be an email ad‐
       dress the user has for the service, which must be specified  with  the  **-authservice  **_service_
       switch.   Before  using this, the user must authorize nmh by running **mhlogin **and grant autho‐
       rization to that account.  See [_mhlogin_(1)](https://www.chedong.com/phpMan.php/man/mhlogin/1/markdown) for more details.

       If **nmh **has been compiled with TLS support, the **-tls **and **-initialtls **switches will require the
       negotiation of TLS when connecting to the remote POP server.  The **-tls **switch will  negotiate
       TLS  as  part of the normal POP protocol using the STLS command.  The **-initialtls **switch will
       negotiate TLS immediately after the connection has taken place, before any POP  commands  are
       sent  or  received.  Data encrypted by TLS is labeled `(tls-encrypted)' and `(tls-decrypted)'
       with viewing the POP transaction with the **-snoop **switch.  The **-notls **switch will disable  all
       attempts to negotiate TLS.

       When  using  TLS  the default is to verify the remote certificate and SubjectName against the
       local trusted certificate store.  This can be controlled by the **-certverify **and **-nocertverify**
       switches.  See your OpenSSL documentation for more information on certificate verification.

## FILES
       $HOME/.mh_profile          The user profile
       /etc/nmh/mts.conf          nmh mts configuration file
       /var/mail/$USER            Location of mail drop

## PROFILE COMPONENTS
       None

## SEE ALSO
       [_inc_(1)](https://www.chedong.com/phpMan.php/man/inc/1/markdown), [_mh-mail_(5)](https://www.chedong.com/phpMan.php/man/mh-mail/5/markdown), [_post_(8)](https://www.chedong.com/phpMan.php/man/post/8/markdown)

## DEFAULTS
       `**user**' defaults to the current user
       `**-date**'
       `**-notify all**'

## CONTEXT
       None

nmh-1.8                                      2016-11-02                                  [_MSGCHK_(1mh)](https://www.chedong.com/phpMan.php/man/MSGCHK/1mh/markdown)