Hello,
I've setup Postfix 2.7.0 to relay all mails to the local proxy spampd:
smtp inet n - n - 25 smtpd
-o smtpd_proxy_filter=127.0.0.1:10025
-o smtpd_proxy_options=speed_adjust
127.0.0.1:10026 inet n - n - - smtpd
-o smtpd_authorized_xforward_hosts=127.0.0.0/8
-o smtpd_client_restrictions=
-o smtpd_helo_restrictions=
-o smtpd_sender_restrictions=
-o smtpd_recipient_restrictions=permit_mynetworks,reject
-o smtpd_data_restrictions=
-o mynetworks=127.0.0.0/8
-o receive_override_options=no_unknown_recipient_checks
-o smtpd_client_connection_count_limit=25
This works well for ~10.000 mails a day, but not for one kind of spam that
occured first two weeks ago. It is always very similar (one line, just varying
URL and spam bot): http://pastebin.com/4arTzeRu
These mails are just delivered to the mailbox, without any other log entry.
Unfortunately it's not really possible to run Postfix in debug mode, since I
can't reproduce the problem and would have to wait for the next occurance.
It's not a big problem since there are max. 5 of these spams getting through on
the whole server per day. But I really want to investigate it and would be
happy if anybody had an idea.
Jan-Kaspar
