[Mimedefang] all_spam_to and mimedefang - accessing envelope sender addresses

[Mark G. Thomas]

Hi,

My SpamAssassin all_spam_to listed recipients are still getting spam
filtered on messages they are BCC'd on. I take it SpamAssassin
uses TO/CC/BCC fields to match on all_spam_to. When SpamAssassin is
run via MimeDefang though, I'd think MimeDefang could and probably
does make accessible envelope recipient information to SpamAssassin.

Is there some way I can use spamassassin rules to match the envelope 
recipient instead of TO/CC/BCC headers, for recipient-specific rules
like all_spam_to?  Alternatively, does anyone have any examples of
accomplishing this in mimedefang-filter (via filter_recipient?)?
I see the example in mimedefang-filter(5), but I really just want
to bypass all SpamAssassin tests for some given list of possible 
recipients, or compensate the score.

Sure, I could configure sendmail to stick it in a header, then use a 
SpamAssassin header rule, but then that would disclose BCC recipients.

There are really two related things I'd like to accomplish:

- Whitelist all inbound messages to certain recipients, using envelope
   information instead of TO/CC/BCC headers.

- Be able to accept a whitelisted recipient copy, but still reject
   for other recipients of that same message.

I don't care whether I perform these things in mimedefang-filter or in
a SpamAssassin rule.

I think I remember mention of being able to do the second thing with
sendmail-8.14.x milter support (I'm still running 8.13.8), but I don't
remember the specifics and am guessing others here have probably already 
done this, so any pointers to details or examples would be very welcome.

Mark


-- 
Mark G. Thomas (Mark at Misty.com)
voice: 215-591-3695
http://mail-cleaner.com/