Hello, Should a system that gives the following response to a SMTP request give a code 450 error or a code 550 error (I did think a code 550 should be given).
(host mxfilter4.domain.net[70.34.y.z] said: 450 4.1.1 <u...@domein.nl>: Recipient address rejected: undeliverable address: host mail.domein.nl[70.34.x.y] said: 550 "Unknown User" (in reply to RCPT TO command) (in reply to RCPT TO command)) I did change domain names and the email address and IP addresses (as they aren't needed in this example and pointing to someone is also something I don't want to do). Is what I suspect correct or are I wrong? Current situation: - it gives a 450 error code (while it receives a 550 error code) I think it should be: - it should give a 550 error code (because it did receive a 550 error code from a server downstream) With kind regards, Mark Scholten
