Can I configure smartlist to *not* send rejected messages to the list maintainer? I am getting a *lot* of spam rejected from a list, that is filling up my mailbox every few days.
If your list is configured to reject foreign submissions, just add the following to your rc.local.r00:
:0 h * ^X-Diagnostic: Not on the accept list /dev/null
Ideally, it would be nice to continue to receive the rejected messages and deal with them, but the volume of spam today makes this totally impractical. The spam completely overwhelms the occasional legit message that someone accidentally sends from one of their other personal addresses. I've tried to accumulate all those additional addresses in the accept2 file to mitigate this problem.
If your incoming mail service provides SPF authentication, you could try something like this:
:0 h * ^X-Diagnostic: Not on the accept list * ! ^Authentication-Results: *mx.google.com;.*spf=pass /dev/null
(Be sure to change "*mx.google.com" to a pattern that matches your incoming mail servers.) Given the sparse support for SPF so far, this is probably still a bit too drastic, though not as drastic as the first solution.
Here's something else I've tried to at least eliminate forged from addresses:
# (Extracted and simplified from some more complicated code, so this is untested.) # Extract the envelope-from address... :0 h X_ENV_FROM=| formail -c -x "From " | sed -e 's/^ *//' -e 's/ .*$//' # ... and match it with the From: address. :0 h * X_ENV_FROM ?? ^[a-zA-Z0-9_.+-]+@[a-zA-Z0-9_.-]+$ * ! $ ^From: .*${X_ENV_FROM} /dev/null
This is also a bit overzealous, as many people have legitimate reasons for non-matching envelope-from and from addresses, but it should still let the majority of non-spam-but-still-foreign submissions through, while dropping much of the spam.
-cary