amavisd-milter --- sendmail milter for amavisd-new


     amavisd-milter [-fhv] [-d debug-level] [-D delivery-care-of]
                [-m max-conns] [-M max-wait] [-p pidfile] [-P]
                [-q backlog] [-s socket] [-t timeout] [-S socket]
                [-T timeout] [-w directory]


     The amavisd-milter is a sendmail milter (mail filter) for amavisd-new
     2.4.3 and above and sendmail 8.13 and above (limited support for 8.12 is

     Instead of older amavis-milter helper program, full amavisd-new
     functionality is available, including adding spam and virus information
     header fields, modifying Subject, adding address extensions and removing
     certain recipients from delivery while delivering the same message to the

     For more information you can visit amavisd-milter website:

     and SourceForge project:

     The options are as follows:

     -d debug-level
         Set the debug level to debug-level.  Debugging traces become more
         verbose as the debug level increases.  Maximum is 9.

     -D delivery-care-of
         Set AM.PDP request attribute delivery_care_of to client (default)
         or server.  When client method is used then amavisd-milter is
         responsible to forward the message to recipients. This method
         doesn't allow personalized header or body modification.

         When server method is used then amavisd-new is responsible to
         forward the message to recipients and can provide personalized
         header and body modification.  $forward_method in amavisd.conf
         must point to some place willing to accept mail without further
         checking in amavisd-new.

     -f      Run amavisd-milter in the foreground (i.e. do not daemonize).
         Print debug messages to the terminal.

     -h      Print help page and exit.

     -m max-conns
         Maximum concurrent amavisd connections (default 0 - unlimited
         number of connections).  It must agree with the $max_servers
         entry in amavisd.conf.

     -M max-wait
         Maximum wait for connection to amavisd in seconds (default 300 =
         5 minutes).  It must be less then sending MTA timeout for a
         response to the final "."  that terminates a message on sending
         MTA.  sendmail has default value 1 hour, postfix 10 minutes and
         qmail 20 minutes.  We suggest to use less than 10 minutes.

     -p pidfile
         Use this pid file (default /var/run/amavis/

     -P      When amavisd-new fails mail will be passed through unchecked.

     -q backlog
         Sets the incoming socket backlog used by listen(2).  If it is not
         set or set to zero, the operating system default is used.

     -s socket
         Communication socket between sendmail and amavisd-milter (default
         /var/lib/amavis/amavisd-milter.sock).  The protocol spoken over
         this socket is MILTER (Mail FILTER).  It must agree with the
         INPUT_MAIL_FILTER entry in

         The socket should be in "proto:address" format:
         *   {unix|local}:/path/to/file - A named pipe.
         *   inet:port@{hostname|ip-address} - An IPV4 socket.
         *   inet6:port@{hostname|ip-address} - An IPV6 socket.

     -S socket
         Communication socket between amavisd-milter and amavisd-new
         (default /var/lib/amavis/amavisd.sock).  The protocol spoken over
         this socket is AM.PDP (AMavis Policy Delegation Protocol).  It
         must agree with the $unix_socketname entry in amavisd.conf.

         The socket should be in "proto:address" format:
         *   {unix|local}:/path/to/file - A named pipe.

     -t timeout
         sendmail connection timeout in seconds (default 600 = 10
         minutes).  It must agree with the INPUT_MAIL_FILTER entry in and must be greater than or equal to the amavisd-new
         connection timeout.  When you use other milters (especially time-
         consuming), the timeout must be sufficient to process message in
         all milters.

     -T timeout
         amavisd-new connection timeout in seconds (default 600 = 10
         minutes).  This timeout must be sufficient for message processing
         in amavisd-new.  It's usually a good idea to adjust them to the
         same value as sendmail connection timeout.

     -v      Report the version number and exit.

     -w directory
         Set working directory (default /var/lib/amavis/tmp).

   Limited support for sendmail 8.12
     *   smfi_addheader() is used instead of smfi_insheader() for insheader
     and addheader AM.PDP responses. This works well with amavisd-new
     2.4.3 or newer.
     *   smfi_progress() isn't called when amavisd-milter wait for amavisd-new
     communication socket.
     *   AM.PDP response quarantine isn't implemented.


         The default process-id file.

         The default sendmail communication socket.

         Th default amavisd-new communication socket.

         The default working directory.


     When remote client is authenticated, amavisd-milter forward this
     information to amavisd-new through AM.PDP request attribute policy_bank:

         Indicate that the remote client is authenticated.

         Remote client authentication mechanism.

         The number of bits used for the key of the symmetric cipher when
         authentication mechanism use it.


   Configuring amavisd-new
     In amavisd.conf file change protocol and socket settings to:

       $protocol = "AM.PDP";                      # Use AM.PDP protocol
       $unix_socketname = "$MYHOME/amavisd.sock"; # Listen on Unix socket
       ### $inet_socket_port = 10024;             # Don't listen on TCP port

     Then (re)start amavisd daemon.

   Configuring sendmail
     To the file add the following entries:

               confMILTER_MACROS_ENVFROM`, r, b')
               F=T, T=S:10m;R:10m;E:10m')

     Then rebuild your file, install it (usually to
     /etc/mail/ and (re)start sendmail daemon.

   Running amavisd-milter
     This example assume that amavisd-new is running as user amavis.  It must
     agree with the entry $daemon_user in amavisd.conf.

     First create working directory:

       mkdir /var/lib/amavis/tmp
       chmod 750 /var/lib/amavis/tmp
       chown amavis /var/lib/amavis/tmp

     Then start amavisd-milter as non-priviledged user amavis:

       su - amavis -c "amavisd-milter -w /var/lib/amavis/tmp"

   Limiting maximum concurrent connections to amavisd
     To limit concurrent connections to 4 and fail after 10 minutes (10*60
     secs) of waiting run amavisd-milter with this options:

       su - amavis -c "amavisd-milter -w /var/lib/amavis/tmp -m 4 -M 600"

     For troubleshooting run amavisd-milter on the foreground and set debug
     level to appropriate level:

       su - amavis -c "amavisd-milter -w /var/lib/amavis/tmp -f -d level"

     where debug levels are:

     1     Not errors but unexpected states (connection abort etc).

     2     Main states in message processing.

     3     All amavisd-milter debug messages.

     4-9   Milter communication debugging (smfi_setdbg 1-6).



     This manual page was written by Petr Rehor <> and is based on
     Jerzy Sakol <> initial work.


     A community mailing lists are available at:

     Enhancements, requests and problem reports are welcome.

     If you run into problems first check the users mailing list archive
     before asking questions on the list.  It's highly likely somebody has
     already come across the same problem and it's been solved.


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