Hi all, we have Exchange 2010 running on Server 2008r2 and have some email stuck in the outgoing quee with the following code in the log :-
"451-4.4.0 Primary target IP address responded with: ""554-kundenserver.de (mxeue101) Nemesis ESMTP Service not available
451-4.4.0 554-No SMTP service
451-4.4.0 554-Bad DNS PTR resource record.
451 4.4.0 554 For explanation visit http://postmaster.1and1.com/en/error-messages?ip=220.127.116.11&c=rdns
."" Attempted failover to alternate host, but that did not succeed. Either there are no alternate hosts, or delivery failed to all alternate hosts."