There is a function for "whitelist-to" which allows mail to the person in the
"to" field (not exactly, but you get my meaning).  What about a blacklist-to?
We have usernames that consistently show up in the to: or cc: for spam, and
we know for sure any mail addressed to those users is spam (the user accounts
are not valid, or no longer extant).  Please add a blacklist-to configuration.

Also, a very nice rule to add would be a "to-is-invalid-user" rule.  This rule
checks the local user database (or a file?) and if the to: is invalid, then
that adds to the scoring.  This might be the same as my proposed blacklist-to
but is more generic.

In fact, several rules:

to-is-invalid-user
to-is-blacklisted-user
to-has-mixed-nums
to-starts-with-num
etc.

This actually is quite powerful.  For example, I have performed some tests
where I create a "honeypot" account and subscribe/publish/distribute the
honeypotted email address.  Filtering by "to" seems to be quite lacking
in SpamAssassin.

Or am I missing something?  Any help?


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