I have two hub transport servers and ServerA is bridghead(because there are two E2k3 servers still) and mail outbound and inbound mail server to entire organization while Server B is oridinary hub transport server through which mail is routed and then routed to Server A if recipients are on e2k7 or on internet domains. So, when mail is routed from Server B to Server A a little delay happens and messages are in queue with message: 451 4.4.0 Primary target IP address responded with: â454 4.7.0 Temporary authentication failure.â Attempted failover to alternate host, but that did not succeed. Either there are no alternate hosts, or delivery failed to all alternate hosts. After a 1 to 5 minutes messeages are routed to Server A. I also noticed that messages from E2k3 servers are delayed to Server A too and after few minutes they route to Server A. Sometimes it takes even 10 minutes for mails to route to Server A. Why is that happening? Thank you.
