From: Wietse Venema (wietseporcupine.org)
Date: Thu May 17 2012 - 13:31:19 CDT

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Ben Rosengart:
> On Thu, May 17, 2012 at 01:19:52PM -0400, Wietse Venema wrote:
> >
> > Adding headers is implemented in cleanup(8). Headers will never be
> > added when smtpd(8) is followed by a before-queue content filter.
> > Perhaps that is your problem?
>
> No, but I appreciate the process behind the guess.
>
> > Otherwise, can you provide a small Perl sample that reproduces
> > the problem?

I installed Sendmail::PMilter and it works out of the box (I used
TCP instead of UNIX-domain because I didn't want to mess with chroot
configuration).

        Wietse

Script code:

    #!/usr/bin/perl

    use IO::Select;
    use IO::File;
    use Sendmail::PMilter ':all';

    my $sock = "inet:9999";

    my $milter = Sendmail::PMilter->new();
    # Do this before dropping privs.
    $milter->setconn($sock);
    $milter->register('floodstopper', { eom => \&eom_callback, }, SMFIF_ADDHDRS);
    $milter->set_dispatcher( Sendmail::PMilter::sequential_dispatcher() );
    $milter->main();

    sub eom_callback {
      my $ctx = shift;

      $ctx->addheader('X-MS-Floodstopper', 'hi!');
      print "addheader 'X-MS-Floodstopper', 'hi!'\n";
      return(SMFIS_CONTINUE);
    }

Postconf configuration:

    non_smtpd_milters = inet:127.0.0.1:9999

Commands 1:

    $ perl *pl
    addheader 'X-MS-Floodstopper', 'hi!'

Commands 2:

    $ echo test|sendmail -f wietselocalhost wietselocalhost

Message in inbox, domain name censored:

    From wietselocalhost.example.com Thu May 17 14:23:21 2012
    Return-Path: <wietselocalhost.example.com>
    X-Original-To: wietselocalhost
    Delivered-To: wietselocalhost.example.com
    Received: by laptop.example.com (Postfix, from userid 0)
            id D8BF020D6C6B; Thu, 17 May 2012 14:23:20 -0400 (EDT)
    Message-Id: <20120517182320.D8BF020D6C6Blaptop.example.com>
    Date: Thu, 17 May 2012 14:23:20 -0400 (EDT)
    From: wietselocalhost.example.com (Wietse Venema)
    X-MS-Floodstopper: hi!

    test

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