I have a new build of Ex13 CU2 which I migrated over from Ex07. Single server for all roles. Periodically I see this message right after "354 Start mail input":
Message or connection acked with status Retry and response 441 4.4.1 Error encountered while communicating with primary target IP address: ""421 4.4.2 Connection dropped due to ConnectionAborted."" Attempted failover to alternate host, but that did not succeed. Either there are no alternate hosts, or delivery failed to all alternate hosts. The last endpoint attempted was x.x.x.x:2525"
I originally saw this when receiving mail from my pbx on my lan. Sending log from pbx:
12240 >>> Content-Transfer-Encoding: 7bit
12240 >>> <rest of the data>
12240 >>> .
12232 <<< 250 2.6.0 <201310241234.r9OCYL6S012229@pbx.domain.com> [InternalId=1550483193875] Queued mail for delivery
12232 >>> QUIT
12232 <<< 221 2.0.0 Service closing transmission channel
12240 <<< 451 4.7.0 Temporary server error. Please try again later. PRX5
12240 >>> QUIT
12240 <<< 221 2.0.0 Service closing transmission channel
It looks like the mail data is accepted, but then what is the error about? Now that I have been looking at the logs, I also see legitimate outside mail getting the same error. I have looked at other e-e posts but can't find a solution to this.
The fact that it mentions endpoint using port 2525 makes me think it's related to the default HUB recv connector, but I'm not sure where to look to get to the next step. Users have complained that mail takes longer at times - I suspect this is the reason, and it gets through on the next attempt.
Exchange gurus, any help here?