Karanbir Singh wrote: > hi, > > Whats the 'robust' way to make sure email to a specific destination is > only accepted if it came over the localhost:25 or /usr/sbin/sendmail > route ? anything else should get a 5xx error. Emails to other > destinations should remain unaffected. > > Using postfix/c4. Had a look around, and header_checks might be one way > to go. > The easiest way is probably to edit master.cf and make smtpd only listen on localhost:25. So instead of # smtp inet n - n - - smtpd Use 127.0.0.1:smtp inet n - n - - smtpd Otherwise us an access table. Glenn