Re: [exim] Queue life for 5xx + Connection errors

>
> If Exim tries to deliver a message to a remote server and gets a 5xx
> code back, say 550 no such user, am I right in thinking the message
> should fail right away with an NDR, not remain on the queue being
> re-tried?

Yes. The remore system has sent a permanent rejection response back, the email should be regarded as unable to be delivered.
>
> More sticky, if a remote server refuses connections from Exim - say it
> is firewalling off the connecting ip, should that fail at once or stay
> on the queue for x hours?

Exim should queue mail for the remote server - based on the retry time rules defined.

John