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Server wide spam stop with qmail

by Juerd (Abbot)
on Jan 04, 2003 at 01:41 UTC ( #224169=CUFP: print w/ replies, xml ) Need Help??

I spent the past few days looking for a good way to implement spamassassin server wide. Most solutions involve creating a .qmail files for all virtual users, but I don't like that. There's qmail-scanner that can use spamassassin to tag messages, but does not stop spam delivery. Local users benefit from /etc/procmailrc, but virtual users cannot.

To make things even worse, I don't want to stop spam, but deliver it to a mailbox that I can review to see if my spamassassin settings are correct.

After hours of searching and not finding anything that did what I want, I hacked up this little script that does exactly what I want. Perl's just the glue that holds things together, but I couldn't find strong glue like this elsewhere.

#!/usr/bin/perl # Server wide spam stopper for qmail, second version. # Meant to be used with qmail-qfilter and spamassassin. # Does not require or use procmail. # Use at your own risk. Sysadmin skills are required. # Made by Juerd Waalboer. # In tcpserver configuration or init.d/qmail # QMAILQUEUE=/path/to/somefilter # # #!/bin/sh # # This is /path/to/somefilter # exec /path/to/qmail-qfilter \ # /path/to/spamc -- \ # /path/to/thisscript -- \ # This Perl script # /path/to/qmail-inject -n use strict; use Sys::Hostname qw(hostname); use Time::HiRes qw(gettimeofday); use Fatal qw(open close link unlink); my $maildir = '/var/spam'; # Maildir to store spam in. my $spam = 0; my $headers = ''; while (<>) { /^$/ and do { $/ = \65536; if ($spam > 0) { my $tph = join '.', time(), "$$\_".(gettimeofday)[1], hostname(); open my $fh, ">$maildir/tmp/$tph"; print $fh $headers, $_; print $fh $_ while <>; close $fh; chmod 0660, "$maildir/tmp/$tph"; link "$maildir/tmp/$tph", "$maildir/new/$tph"; unlink "$maildir/tmp/$tph"; exit 99; # "Succesful", but don't deliver } else { print $headers, $_; print while <>; exit 0; # Deliver it } }; /^X-Spam-Flag: YES/ and $spam++; $headers .= $_; }

- Yes, I reinvent wheels.
- Spam: Visit eurotraQ.

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Re: Server wide spam stop with qmail
by Aristotle (Chancellor) on Jan 04, 2003 at 03:50 UTC
    You can greatly simplify this by playing with the record separator. Something like the following:
    #!/usr/bin/perl -w use strict; use Sys::Hostname qw(hostname); use Time::HiRes qw(gettimeofday); use Fatal qw(open close link unlink); use constant FORWARD => 0; use constant SUCCESS_DONTFORWARD => 99; my $maildir = '/var/spam'; # Maildir to store spam in. { local $/ = "\n\n"; $_ = <>; undef $/ my $body = <>; } exit !/^X-Spam-Flag:\s+YES/m ? print($_, $body), FORWARD : do { my $tph = join ".", time(), "$$\_".(gettimeofday)[1], hostname(); my $temp = "$maildir/tmp/$tph"; umask 007; # Name's Bond.. { open my $fh, ">", $temp; print $fh $_, $body; } link $temp, "$maildir/new/$tph"; unlink $temp; SUCCESS_DONTFORWARD; };
    Untested..

    Makeshifts last the longest.

      undef $/ my $body = <>;

      E-Mail can be very large. Body includes attachments, so I prefer being slow over using a lot of memory.

      - Yes, I reinvent wheels.
      - Spam: Visit eurotraQ.
      

        Ah, good point. In that case you might consider using, say, $/ = \32768; to read 32k chunks while printing the body - gets rid of the useless end-of-line scanning overhead.

        Makeshifts last the longest.

Re: Server wide spam stop with qmail
by ask (Pilgrim) on Jan 04, 2003 at 04:54 UTC
    Somewhat related, you might be interested in qpsmtpd.

    "qpsmtpd is a qmail-smtpd replacement written in perl. The new features over the normal qmail-smtpd are primarily tools to avoid accepting mails we have to bounce anyway and a object oriented system for easily writing extension plugins." It includes a spamassassin plugin.

    - ask

    -- 
    ask bjoern hansen, http://www.askbjoernhansen.com/   !try; do();
    

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