It appears that Justin is right: MIMEDefang apparently uses its own rewriting in the script /etc/mail/mimedefang-filter and seemingly ignores the /etc/mail/spamassassin/sa-mimedefang.cf config file (or some of it ?).
MIMEDefang uses SpamAssassin to *check* mail only. Any parts of sa-mimedefang.cf related to checking mail *do* get used. However, remember that Sendmail and Mimedefang do not run as the individual user, so features like auto-whitelisting will not work.
Using the return values from spam_assassin_check(), you can have MD add any kind of markup you want, take different actions depending on which rules are tripped or how high the score is, etc.
I found a MIMEDefang solution by Kelson Vibber in the message: http://lists.roaringpenguin.com/pipermail/mimedefang/2002-July/001650.html where one uses a function like in this example: action_change_header('Subject', $NewSubject);
For a simpler example you can look at the sample filters that come with MD. Also, if you're basing a filter off of this post and intend to do something special based on Razor, remember that Razor 2 trips a different rule, RAZOR2_CHECK.
Also, the bit about breaking the report into separate lines is no longer needed; someone pointed out a better way to handle it:
my $fixed_report = $report;
$fixed_report =~ s/\n+\z//g; # fixes for multiline header
$fixed_report =~ s/\n/\n\t/g; # to stop sendmail complaining
action_add_header("X-Spam-Report","$fixed_report");
In any case, further discussion of the filter should probably go over to the MIMEDefang lists.
Kelson Vibber
SpeedGate Communications <www.speed.net>
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