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MSGCHK(1mh)                                                        MSGCHK(1mh)

NAME
       msgchk - nmh's check for incoming email

SYNOPSIS
       msgchk [-help] [-version] [-date | -nodate] [-notify all/mail/nomail ]
            [-nonotify all/mail/nomail ] [-host hostname] [-user username]
            [-sasl | -nosasl] [-saslmech mechanism] [-initialtls] [-notls]
            [-certverify | -nocertverify] [-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  ms-
       gchk'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.

       To specify a username for authentication with the POP server,  use  the
       -user  username  switch.   The credentials profile entry in the mh-pro-
       file(5) man page 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 en-
       able the use of SASL authentication.  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  the
       mh-profile(5)  man page).  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 the post man page 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 address 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 authorization to that account.  See the mhlogin man
       page for more details.

       If nmh has been compiled with TLS support, the -initialtls switch  will
       require  the  negotiation  of  TLS  when  connecting  to the remote POP
       server.  The -initialtls switch will negotiate  TLS  immediately  after
       the connection has taken place, before any POP commands are sent or re-
       ceived.  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 Sub-
       jectName against the local trusted certificate store.  This can be con-
       trolled 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), mh-mail(5) post(8)

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

CONTEXT
       None

nmh-1.7.1                         2016-11-02                       MSGCHK(1mh)