DOKK / manpages / debian 11 / policyd-weight / policyd-weight.8.en
policyd-weight(8) System Manager's Manual policyd-weight(8)

policyd-weight - weighted SMTP policy daemon

Beta, Documentation incomplete



policyd-weight [-option] [-option2
    <arg>] command












policyd-weight(8) is a SMTP policy daemon written in
    perl(1) for postfix(1). It evaluates based on RBL/RHSBL
    results, HELO and MAIL FROM domain and subdomain arguments and the client IP
    address the possibility of forgery or SPAM. It is designed to be called
    before the SMTP DATA command at the RCPT TO stage. This way it is a)
    possible to reject a mail attempt before the body has been received and b)
    to keep multirecipient mail intact, i.e. provide the functionality of
    selective usage based on recipients.


To make policyd-weight(8) work with postfix(1), it
    is required to add a system account for $USER (default: polw)


Policyd-weight can operate in master.cf or daemon mode. In
    master.cf mode it uses postfix' spawn(8), which results in number of
    simultaneous requests perl instances. In daemon mode it uses shared memory
    and forks on load, and only if all child processes are busy.


At the time of writing the man-pages for policyd-weight assume a
    postfix installation. It has been reported that policyd-weight works with
    other MTAs like Exim, too.

















  

  

    

    policy unix - n n - - spawn user=polw
    

       argv=/usr/bin/perl
    /usr/local/bin/policyd-weight

  

  

    

    smtpd_recipient_restrictions =
    

       permit_mynetworks,
    

       ... authenticated permits ...
    

       reject_unauth_destination,
    

       ... whitelists, role accounts, clients ...
    

       check_policy_service unix:private/policy
    

    

    

  










start the daemon with policyd-weight start. Poliyd-weight
    then listens on $TCP_PORT (default: 12525) for policy requests. To make
    postfix talk to that port do following changes to main.cf:



  

  

    

    smtpd_recipient_restrictions =
    

       permit_mynetworks,
    

       ... authenticated permits ...
    

       reject_unauth_destination,
    

       ... whitelists, role accounts, clients ...
    

       check_policy_service inet:127.0.0.1:12525
    

    

    
It is possible to have more than one postfix server talk to
        the daemonized policyd-weight by configuring each postfix machine
        to query the policy server with check_policy_service inet:IP:12525 where
        IP is the host on which policyd-weight runs.

    

    
Please note that check_policy_service should come at
        last, or at least after reject_unauth_destination, or else you
        may become an open relay.

  












Following commands exist and are reserved for daemon mode
  only:



  

  

  

  

  

  

  

  

  

  

    

  













  

  
Not for use in master.cf. In debug mode everything is reported on
      STDOUT instead of syslog(3). Also an own debug cache daemon will be
      spawned. The socket-file is named after the value of $SPATH with
      ".debug" as suffix.
    

  

  

  
Pass a configuration file to policyd-weight
    

  

  

  

    

  

  

  
Not for use in master.cf. Together with -d this kills the
      debug cache daemon. Without -d it kills the global running cache
      daemon.
    

  

  

  
Not for use in master.cf.
    

  

  

  

    

  












Logging is done via syslog(3) with facility
    "mail" and priority "info". For a complete list of log
    entries and their correspondending configuration parameters refer to
    policyd-weight.conf(5).










Please report bugs to r.felber@ek-muc.de












  

  
Ralf Hildebrandt (Author of the Book of Postfix) is the spiritual father
      of policyd-weight. It was his idea to have a scored RBL evaluation, I've
      added the weighted MAIL FROM/HELO DNS-evaluation. For that purpose I used
      Meng Wong's spf.pl which was shipped with the postfix source as example.
    

  










/etc/policyd-weight.conf, Policyd-weight configuration file
/etc/postfix/main.cf, Postfix configuration parameters
/etc/postfix/master.cf, Postfix daemon processes










policyd-weight.conf(5), Policyd-weight configuration file
master(5), Postfix master.cf file syntax
postconf(5), Postfix main.cf file syntax
access(5), Postfix SMTP access control table









GNU General Public License 








Robert Felber <r.felber@ek-muc.de>
Autohaus Erich Kuttendreier
81827 Munich, Germany







  

    Aug 25th, 2006