Outboud messages sit in Queue with the following error 451 4.4.0 primary target IP address responded with "4184.108.40.206 unable to connect."
Posted on 2008-10-22
I have just installed Exch2007 and am having problems with sending mail.
Messages just sit in the queue with the follwoing error message:
451 4.4.0 primary target IP address responded with "4220.127.116.11 unable to connect."attempted failover to alternate host, but that did not succeed.Either there are no alternate hosts, or delivery failed to all alternate hosts.
Any ideas what is wrong or what I shoudl be checking?
Incoming mail is fine.
Exchange 2007 SP1
Server 2008 x64