Hola. I installed PostFix 3.1.
I added these to the main.cf configuration file: unverified_recipient_reject_reason = bad address unverified_recipient_defer_code = 450 unverified_recipient_reject_code = 550 So a unverified_recipient rejection I think should respond by a 550. When I send the test email to a bad address that does not exist the PostFix server is responding with a 450: Apr 21 09:40:00 tanzer postfix/smtpd[5173]: NOQUEUE: reject: RCPT from w1.tutanota.de[81.3.6.162]: 450 4.1.1 <badaddr...@m....de>: Recipient address rejected: unverified address: bad address; from=<l...@tutanota.com> to=<badaddr...@m....de> proto=ESMTP helo=<w1.tutanota.de> So I think it is deferred not rejected? I want to reject this email. What must the configuration be to 550 reject not 450 defer?
