Hi,
We are using Exchange 2010 with sp3.i am facing issue in few days;
Delaying email to one external domain. After sitting in the queue over night they are sent successfully. Email to anyone else is sent right away. Any ideas on what is causing this?
Following is the message in Msg Queue viewer.
"451.4.4.0 Primary target Ip address responded with "421.4.4.2 Connection dropped due to SocketError "Attempted failover to alternate host, but taht did not succeed. Either there are no alternate hosts, or delivery failed to all alternate
hosts".