Provided by: nmh_1.3-1build1_amd64 bug


       mh-tailor, mts.conf - mail transport customization for nmh message handler




       The  file /etc/nmh/mts.conf defines run-time options for those nmh programs which interact
       (in some form) with the message transport system.  At present, these (user) programs  are:
       ap, conflict, inc, msgchk, msh, post, rcvdist, and rcvpack.

       Each  option should be given on a single line.  Blank lines and lines which begin with `#'
       are ignored.  The options available along with default values and a description  of  their
       meanings are listed below:

            The  mail transport method to use.  The two acceptable options are smtp (which is the
            default), and sendmail.

            If you use smtp, this will enable a direct  SMTP  (simple  mail  transport  protocol)
            interface  in  nmh.   When  sending  mail, instead of passing the message to the mail
            transport agent, post will open a socket connection to the mail port on  the  machine
            specified in the servers entry.

            If  you  use  sendmail,  then  post  will  send  messages  by forking a local copy of
            sendmail.  Currently it will still speak SMTP with this local copy of sendmail.

            The hostname nmh considers local.  It should typically be a fully qualified hostname.
            If  this  is not set, depending on the version of UNIX you're running, nmh will query
            the system for this value (e.g. uname,  gethostname,  etc.),  and  attempt  to  fully
            qualify this value.

            If  you are using POP to retrieve new messages, you may want to set this value to the
            name of the POP server, so that outgoing message appear to have originated on the POP

            If this is set, a `.' followed by this string will be appended to your hostname.

            This  should  only be needed, if for some reason nmh is not able to fully qualify the
            hostname returned by the system (e.g. uname, gethostname, etc.).

            This option specifies the host name that nmh will give in the SMTP  HELO  (and  EHLO)
            command, when posting mail.  If not set, the default is to use the host name that nmh
            considers local (see localname above).  If this option is set,  but  empty,  no  HELO
            command will be given.

            Although the /B HELO command is required by RFC-821, many SMTP servers do not require
            it.  Early versions of SendMail will fail if the hostname given in the  HELO  command
            is  the  local  host.   Later versions of SendMail will complain if you omit the HELO
            command.  If you run SendMail, find out what your system expects and set  this  field
            if needed.

            This  option  is only used for UUCP mail.  It specifies the name of the local host in
            the UUCP “domain”.  If not set, depending on the version of UNIX you're running,  nmh
            will  query  the  system  for  this  value.   This  has  no  equivalent  in  the  nmh
            configuration file.

       mmdfldir: /var/mail
            The directory where maildrops are kept.  If this option is set, but empty, the user's
            home  directory  is  used.   This  overrides  the default value chosen at the time of

            The name of the maildrop file in the directory where maildrops are kept.  If this  is
            empty,  the  user's  login  name is used.  This overrides the default value (which is

       mmdelim1: \001\001\001\001\n
            The beginning-of-message delimiter for maildrops.

       mmdelim2: \001\001\001\001\n
            The end-of-message delimiter for maildrops.

            This directive controls three different types of  email  address  masquerading.   The
            three  possible  values,  which  may  be  specified  in  any combination on the line,
            separated by spaces, are “draft_from”, “mmailid”, and “username_extension”.

            “mmailid” was the  only  type  of  masquerading  in  the  original  MH  package,  and
            apparently  stands  for  “masquerade mail identification”.  This type of masquerading
            keys off of the GECOS field of the passwd file.  When enabled, nmh will check if  the
            user's pw_gecos field in the passwd file is of the form:

                 Full Name <fakeusername>

            If it is, the internal nmh routines that find the username and full name of that user
            will return “fakeusername” and “Full Name” respectively.  This is useful if you  want
            the  messages  you send to always appear to come from the name of an MTA alias rather
            than your actual account name.  For instance, many organizations set up  “First.Last”
            sendmail  aliases  for all users.  If this is the case, the GECOS field for each user
            should look like:

                 First [Middle] Last <First.Last>

            “username_extension”, when specified on the “masquerade:” line, allows a second  type
            of  username  masquerading.   If  the  user  sets the $USERNAME_EXTENSION environment
            variable, its value will be appended to the actual login name.  For instance, if I am
            “”,  and  I  set $USERNAME_EXTENSION to “-www”, my mail will appear to
            come  from  “”.   This  is  meant   to   interact   with   qmail's
            “user-extension”  feature,  where mail sent to user-string will be delivered to user.
            Likewise, those using versions of sendmail for which  “plussed  user”  processing  is
            active  can  set  $USERNAME_EXTENSION  to  “+string”.   These MTA features are useful
            because they allow one to use different email addresses in different  situations  (to
            aid  in  automatic mail filtering or in determining where spammers got one's address)
            while only actually having a single account.  Note that $USERNAME_EXTENSION  is  only
            appended  to the username when post is generating “[Resent-]From:” lines and the SMTP
            envelope “From:”.  inc, for instance, will not try  to  read  from  a  maildrop  file
            called “dan-www” (to recall the earlier example).

            “draft_from” controls the most powerful type of address masquerading.  Normally, when
            a user explicitly specifies a “From:” header in a draft,  nmh  uses  it  rather  than
            constructing  its  own.   However,  to  discourage  email  forgery, the SMTP envelope
            “From:” and a “Sender:” header are set to the user's real address.  When “draft_from”
            is  turned  on,  though,  the  envelope “From:” will use the address specified in the
            draft, and there will be no “Sender:” header.  This is useful when a  user  wants  to
            pretend to be sending mail “directly” from a remote POP3 account, or when remote mail
            robots incorrectly use the envelope “From:” in preference to  the  body  “From:”  (or
            refuse  to take action when the two don't match).  Note that the MTA may still reveal
            the user's real identity (e.g.  sendmail's “X-Authentication-Warning:” header).

       maildelivery: /usr/lib/mh/maildelivery
            The name of the  system-wide  default  maildelivery  file.   See  slocal(1)  for  the

       everyone: 200
            The highest user-id which should NOT receive mail addressed to “everyone”.

            If  set,  then each user-id greater than “everyone” that has a login shell equivalent
            to the given value (e.g., “/bin/csh”) indicates that mail for “everyone”  should  not
            be sent to them.  This is useful for handling admin, dummy, and guest logins.

   SMTP support
       These options are only available if you set mts to smtp.

       hostable: /etc/nmh/hosts
            The  exceptions  file for /etc/hosts used by post to try to find official names.  The
            format of this file is quite simple:

            1.  Comments are surrounded by sharp (`#') and newline.

            2.  Words are surrounded by white space.

            3.  The first word on the line is the official name of a host.

            4.  All words following the official names are aliases for that host.

       servers: localhost \01localnet
            A lists of hosts and networks which to look for SMTP servers when posting local mail.
            It  turns  out  this  is  a  major win for hosts which don't run an message transport
            system.  The value of servers should be one or more items.  Each item is the name  of
            either  a  host  or a net (in the latter case, precede the name of the net by a \01).
            This list is searched when looking for a smtp server to post  mail.   If  a  host  is
            present,  the SMTP port on that host is tried.  If a net is present, the SMTP port on
            each host in that net is tried.  Note that if you are running  with  the  BIND  code,
            then any networks specified are ignored (sorry, the interface went away under BIND).

       This option is only available if you set mts to sendmail.

       sendmail: /usr/sbin/sendmail
            The pathname to the sendmail program.

   Post Office Protocol
       This  option  is  only  available if you have compiled nmh with POP support enabled (i.e.,

            The name of the default POP service host.  If this is not set, then nmh looks in  the
            standard  maildrop  areas  for  waiting mail, otherwise the named POP service host is

   File Locking
       A few words on locking: nmh has  several  methods  for  creating  locks  on  files.   When
       configuring  nmh,  you  will need to decide on the locking style and locking directory (if
       any).  The first controls the method of locking, the second says where lock  files  should
       be created.

       To  configure  nmh  for kernel locking, use the “--with-locking=flock” configure option if
       you want to use the flock system call; use “--with-locking=lockf” if you want to  use  the
       lockf  system call; or use “--with-locking=fcntl” if you want to use the fcntl system call
       for kernel-level locking.

       Instead of kernel locking, you can configure nmh to use  dot  locking  by  using  “--with-
       locking=dot”.   Dot  locking specifies that a file should be created whose existence means
       “locked” and whose non-existence means “unlocked”.  The name of this file  is  constructed
       by  appending  “.lock” to the name of the file being locked.  If LOCKDIR is not specified,
       lock files will be  created  in  the  directory  where  the  file  being  locked  resides.
       Otherwise, lock files will be created in the directory specified by LOCKDIR.

       Prior  to  installing  nmh,  you  should see how locking is done at your site, and set the
       appropriate values.


       /etc/nmh/mts.conf          nmh mts configuration file




       mh-mts(8), post(8)


       As listed above