Amavis :: Custom - Color Yourself

  amavisd-new is a fairly widespread hand-fed product for spamassassin and clamav. Despite this, some of the tuning options are clearly not enough covered. At least, the author was already thinking about writing his own patch, until he accidentally stumbled into the Amavis :: Custom hook code.
  It all started with the fact that it took me to skip all the checks in amavisd. This is easy to do with a known sender or receiver, or by port-based bank separation. The task becomes less trivial if the signal is any header already accepted for checking the electronic message. This is where (and in a host of other cases) Amavis :: Custom comes into play

  Judging by the documentation from the example file, custom clothespins (?) Are available from version amavisd-new-2.5.0 and allow implementation at the following steps:

Message Processing Sequence

# received a letter, disassembled, collected basic information
# * custom hook: new () - you can view the initial data, load banks, set some parameters
# message check, assign ratings
# custom hook: checks () - called after spam checks and viruses, but until the decision on the fate of the letter. Here you can play with ratings
# decision about the fate of the letter (searches in * _lovers, thresholds, ...)
# quarantine
# sending notifications (to administrators, recipients)
# * custom hook: before_send () - you can send your own notifications, organize quarantine, modify the message modify mail
# forwarding (if not blocked)
# * custom hook: after_send () - you can suppress DSN, send reports
# sending DSN (when necessary)
# logging, statistics
# * custom hook: mail_done () - may inspect results (did not catch the point)

  The complete example provides a significant piece of code to expand consciousness. The author, on the other hand, was completely silent. As a result of some thought, the following letters fell into amavisd-custom.conf:

# try to skip checks if already marked as spam
package Amavis :: Custom;
use strict;
sub new {
  my ($ class, $ conn, $ msginfo) = @_;
  my ($ self) = bless {}, $ class;
 
  for my $ curr_head (@ {$ msginfo-> orig_header}) {
    if ($ curr_head = ~ / ^ X-SpamTest-Status: spam / i) {
      for my $ r (@ {$ msginfo-> per_recip_data}) {
        $ r-> bypass_spam_checks (1);
        $ r-> bypass_banned_checks (1);
      }
    }
  }
  $ self;
}