>> Is postscreen able to identify email as spam to prevent bouncing it? >> Is there a way to alter my postfix configuration to prevent bouncing it? > This is not a matter of 'spam detection'. You have to verify for valid > (means existing) recipients *before* you accept mail. > > Look for reject_unlisted_recipient or reject_unverified_recipients in > the postfix docs.
To be more precise: - verify your recipients - do not reject mails by content filters (as said: use prequeue filters or tag spam mails) - and most important: do not rewrite recipients to non existing third-party accounts (here: google)! Apr 11 05:15:23 mg04 postfix/smtp[28222]: 152B0661BC5: to=<mmoo...@cnm.edu.test-google-a.com <mailto:mmoo...@cnm.edu.test-google-a.com>>, orig_to=<mmoo...@cnm.edu <mailto:mmoo...@cnm.edu>>, relay=gmail-smtp-in.l.google.com <http://gmail-smtp-in.l.google.com>[173.194.76.26]:25, delay=13, delays=9.3/0/0.22/3.2, dsn=5.1.1, status=bounced (host gmail-smtp-in.l.google.com <http://gmail-smtp-in.l.google.com>[173.194.76.26] said: 550-5.1.1 The email account that you tried to reach does not exist. Please try 550-5.1.1 double-checking the recipient's email address for typos or 550-5.1.1 unnecessary spaces. Learn more at 550 5.1.1 http://support.google.com/mail/bin/answer.py?answer=6596 j8si3846254qaz.28 - gsmtp (in reply to RCPT TO command))
