> -----Original Message----- > From: owner-postfix-us...@postfix.org [mailto:owner-postfix- > us...@postfix.org] On Behalf Of Wietse Venema > Sent: Friday, April 30, 2010 8:17 PM > To: Postfix users > Subject: Re: Response codes > > Mark Scholten: > > 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) > > You can configure Postfix to reject such mail or to reply with > 4xx. In the latter case you get a chance to make a whitelist entry > for sites that send legitimate mail with a non-replyable address. > > Wietse
Hello Wietse, What is the best option to do in your opinion? Both codes are no problem if I understand you correctly. With kind regards, Mark Scholten
