  Control local delivery
  Cristiano Otto Von Trompczynski


  11..  OOvveerrrriiddee llooccaall ttrraannssppoorrtt


     LLooccaall ttrraannssppoorrtt
        The "Local transport" option specifies the name of the transport
        for delivery to destinations that match "Destination" or
        "Network Interfaces" options.  This option sets the
        "local_transport" postfix variable.

        By default, local mail is delivered to the transport called
        "local", which is just the name of a service that is defined the
        master.cf file.


  22..  SSeeccuurriittyy ccoonnttrroollss


     LLooccaall ccoommmmaanndd sshheellll
        The "Local command shell" option controls what shell will be
        used for delivery to external command. By default, external
        commands are executed directly; commands are given to given to
        /bin/sh only when they contain shell meta characters or shell
        built-in commands.  This option sets the "local_command_shell"
        postfix variable.

        Specify a different shell when you need more control over what
        programs can be run from e.g. .forward files.

        "sendmail's restricted shell" (smrsh) is what most people will
        use (smrsh is part of recent sendmail distributions)

        Note: when a shell is specified, it is invoked even when the
        command contains no shell built-in commands or meta characters.


     FFoorrwwaarrdd ppaatthh
        The "Forward path" option specifies a search list. The first
        file that is found is used.

        The following expansions are done on forward_path: $user
        (recipient username), $shell (recipient shell), $home (recipient
        home directory), $recipient (full recipient address), $extension
        (recipient address extension), $domain (recipient domain),
        $local (entire recipient localpart), $recipient_delimiter.
        Specify ${name?value} or ${name:value} to expand value only when
        $name does (does not) exist.  This option sets the
        "forward_path" postfix variable.


     AAllllooww mmaaiill ttoo ccoommmmaannddss
        The "Allow mail to commands" option restricts mail delivery to
        external commands. The default is to disallow delivery to
        "|command" in :include: files. This option sets the
        "allow_mail_to_command" postfix variable.


     AAllllooww mmaaiill ttoo ffiilleess
        The "Allow mail to files" option restricts mail delivery to
        external file. The default is to disallow delivery to /file/name
        in :include: files. This option sets the "allow_mail_to_files"
        postfix variable.


  33..  DDeelliivveerreedd--ttoo


     LLooccaall ddeessttiinnaattiioonn rreecciippiieenntt lliimmiitt
        The "Local destination recipient limit" option limits the number
        of recipients per local message delivery.  The default limit is
        taken from the "Default destination recipient limit" option.

        However, the queue manager by design limits the number of
        recipients per local delivery request to exactly 1, so this
        parameter has no effect.


     PPrreeppeenndd ddeelliivveerreedd hheeaaddeerr
        The "Prepend delivered header" option control when Postfix
        should prepend a Delivered-To: message header.

        By default, Postfix prepends a Delivered-To: header when
        forwarding mail and when delivering to file (mailbox) and
        command. Turning off the Delivered-To: header when forwarding
        mail is not recommended.