Hi
Today I got an emergency call from our security team: their mailing
list was "spammed" from a bot (aka ticket system) - as the ticket
system address (which looks it was in CC of one Email to the list)
generated an Email to the list - getting an answer from mlmmj that it
is not subscribed, which generated a new ticket with an automated
answer, which was answered by mlmmj... (I think you got the loop)
As result, I created /etc/postfix/sender_access with :
$EMAIL DROP
inside, did "postmap /etc/postfix/sender_access" and
adapted /etc/postfix/main.cf :
smtpd_recipient_restrictions = [...],check_sender_access
hash:/etc/postfix/sender_access
For the moment, this seems to successful break the loop, but as I'm
neither the maintainer of the system nor sure that this is a
good/stable solution, I hope that I simply did not break too much...
Feel free to adjust/remove/whatever with the above information. Maybe
someone has already a better idea...?
with kind regards,
Lars
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