Hello, I maintain multiple postfix servers with LMTP content filter set up. last week we started receiving much spam that requests NOTIFY=SUCCESS which results in many queued DSNs.
I got the idea of avoid notifications when they reach particular spam score. My problem is, that on (at least) one of servers, postfix sends mail to filter with SUCCESS stripped off NOTIFY= parameter, and sends bounce as the mail gets delivered to LMTP filter. This way the filter is not able to supress notifications. This server runs postfix 2.9.6 on another server postfix is sending NOTIFY=SUCCESS to the LMTP, so the filter is able to do that. This server runs postfix 2.11.3. Can the difference be caused by different postfix versions? Is it possible to let the server pass the "NOTIFY=SUCCESS" I have read the DSN README, and I'm searching if there's a better alternative than disabling DSNs at all. trace from first server: client SMTP session:
MAIL FROM:<valersx0c...@jeffgrzinic.com> BODY=8BITMIME RET=FULL RCPT TO:<x...@example.com> NOTIFY=SUCCESS,FAILURE,DELAY
postfix to LMTP filter: < 250 DSN ...
MAIL FROM:<valersx0c...@jeffgrzinic.com> SIZE=4769 BODY=8BITMIME RET=FULL RCPT TO:<x...@mail.example.com> ORCPT=rfc822;x...@example.com NOTIFY=FAILURE,DELAY
trace from 2nd server - client SMTP session: MAIL FROM:<vavrinecafn3...@jeffgrzinic.com> BODY=8BITMIME RET=FULL RCPT TO:<x...@examnple.net> NOTIFY=SUCCESS,FAILURE,DELAY - postfix to LMTP filter: < 250-DSN < 250 XFORWARD NAME ADDR PORT PROTO HELO IDENT SOURCE ...
MAIL FROM:<vavrinecafn3...@jeffgrzinic.com> SIZE=4891 BODY=8BITMIME RET=FULL RCPT TO:<x...@examnple.net> ORCPT=rfc822;x...@examnple.net NOTIFY=SUCCESS,FAILURE,DELAY
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