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Sendmail + Cyrus Pre-DATA To: Verify
By Anish Mistry
Background - 2007-09-22
Starting yesterday we began receiving lots of incorrect To: spam. This was
causing the postmaster address to be slammed with lots of bogus messages. The
problem is that by default Sendmail does not check with Cyrus until the entire
message is received. So if mail is sent to an invalid address it will just get
bounced to the postmaster address because of our local From: check. To hook
Cyrus checking before the data is received we are now using the following:
Address Verification FEATURE
- Setup the From: check
- Put ckuser_cyrus.m4 into /usr/share/sendmail/cf/feature/
- Add FEATURE(`ckuser_cyrus')dnl to your .mc
- Rebuild your .cf and then stop and start Sendmail.cd /etc/mail && make && make install && make stop && make start
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