Am 19.01.2015 um 21:12 schrieb Michael Fox:
I have a question about the situation where postfix receives a connection from a client trying to send to an invalid recipient address such as u...@nohow.noway.org. Currently, postfix responds with: 450 4.1.2 <u...@nohow.noway.org>: Recipient address rejected: Domain not found What seems reasonable to me is the following: -- If postfix receives a response from DNS that the domain does not exist, then reject with 550 -- Otherwise, delay with 450 (DNS failure, etc.)
nonsense - your own incoming server don't need to depend on DNS to guess what RCPT's are valid - in other words: don't list "reject_unknown_recipient_domain" on top
reject_unauth_destination reject_unlisted_recipient before should reject the invalid RCPT independent of any DNS query
