I would like to disable the mail_check "Disable 'domain of sender address does not resolve". I've done this in /etc/mail/sendmail.cf (actually, via sendmail.mc then I compiled via m4 and ran omsendin, and restarted). This has no effect. Also, as far as I can tell, SMTP Relay accepts mail on public-ip:25, so do I need to change SMTP Relay?
This is really causing a major problem for us as we MUST be able to accept mail from any address. We use SA to work on spam, so that's not our issue (fortunately).
Any ideas?