I recently discovered that some viruses had harvested the list-outgoing
address from some of my mailing lists.
After searching the majordomo-users archive I found others who had
encountered similar problems.
I'm running majordomo-1.94.5 with postfix so the sendmail solutions didn't
work for me.
Though the concept does translate.
The messages are typically using forged headers with return-mail addresses
of innocent
3rd parties. Instead of trying to direct the message via an "error: nouser
User unknown" bounce to
the innocent 3rd party, I elected to create a canonical recipient map table
containing
all of the <list>-outgoing aliases on my server (over 30) and redirect them
to "junkmaster".
This user is then aliased to /dev/null. This way the viruses/spam sent
directly to the list are quietly dropped.
In my main.cf file I added the line:
recipient_canonical_maps = hash:/etc/postfix/recipient_canonical_map
and recipient_canonical_map contains lines similar to the following:
# canonical names to redirect messages sent directly to
"list-outgoing"
#
test-outgoing junkmaster
staff-outgoing junkmaster
parttime-outgoing junkmaster
This list is then compiled using the postmap command
/etc/aliases entry is:
#
# Junk messages that are sent to <list>-outgoing
junkmaster: /dev/null
I hope this is useful to others who encounter this problem.
Chris Knowles
Redeemer University College
Ancaster, Ontario Canada
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