| Could somebody please advise the best method of whitelisting messages
| from a given mailing list? 
| 
| 'whitelist_from' doesn't work because (a) the messages come 'From:'
| individual posters, and (2) the 'Sender:' address (which does reflect
| the mailing list) isn't in the set of headers checked by this directive.
| 
| 'whitelist_to', when given the mailing list address, only contributed
| -6. I guess I could use all_spam_to, but it starts to look a bit odd
| given that the mailing list address doesn't actually represent a local
| user. 

I'll grab this opportunity to repeat my suggestion which
went-by without stirring much interest months ago.

A useful solution to white or blacklist a mailing lists is to check
the envelope address, and not to try to guess the sender address
from mail header. I'm not saying that the present mechanisms should be
replaced or removed, it does have its place, but I'm asking for
an API to allow the caller to pass envelope information to 
Mail::SpamAssassin and perhaps in time to put this information to good use,
such as for white/blacklisting, and perhaps (again) in time to add some
spam checks based on this (optional) information.

For SA checks run on a central mailer (such as is common with amavisd-new 
setup, as opposed to being run during final delivery) I think there is
a tiny wealth of spam-classifying information available from the set
of recipients of a message. When mail is checked at the central MTA,
all envelope recipient addresses are present, and it is quite likely
that none of them appear in mail headers (as is common with mailing lists
and spam). It is a waste to ignore this information when available.

With amavisd-new (which can call SpamAssassin Perl module) I had
to duplicate the white/blacklisting mechanism just in order
to be able to white/blacklist on envelope addresses. All this
could be done by SA, leveraging on its existing config file
settings and mechanisms.

  Mark


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