On Jan 21, 2009, at 11:36 AM, Gábor Lénárt wrote:
450 <u...@domain>: Recipient address rejected: User
unknown in local recipient table (in reply to RCPT TO command))
if there is an invalid, non existing mail address there. However
they argues that they would like us not to try to deliver mails
again and again. It's also a problem for us because of many mails
waiting in the queue. They want us to handle this situation somehow.
Explain to them that 450 means to try again later. You are 'handling
the situation' by doing what their server said to do. If they have an
issue with that, they need to take it up with THEIR server.
If your server should somehow know what users are supposed to exist on
those other servers (as others have mentioned), then that's a separate
issue, but the above still applies. ;)
