Delayed Sending Mail Exchange 2013

Hi,

I have recently setup a new Exchange 2013 system, I have having large delays and failure to send mail to the outside world. The setup is,

2 x Hub and 2 x Mailbox (in a DAG)

The delayed messages I am getting back is as follows,

Remote Server at KLA-SVR-EXHUB2.CAT.internal (10.0.XX.XX) returned '400 4.4.7 Message delayed'
09/08/2013 18:44:46 - Remote Server at KLA-SVR-EXHUB2.CAT.internal (10.0.XX.XX) returned '441 4.4.1 Error encountered while communicating with primary outbound frontend IP address: "421 4.4.2 Connection dropped due to TimedOut." Attempted failover to alternate frontend, but that did not succeed. Either there are no alternate frontend addresses, or delivery failed to all alternate frontend addresses. The last endpoint attempted was 10.0.XX.XX:717'

I have checked and changed the DNS settings on the server to ensure they can ping the outside world, I have ran a reverse lookup, I do still have an issue with the SMTP banner not matching.

Thanks in advance for any help

August 10th, 2013 4:24am

What are you seeing when you telnet to port 25?

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August 10th, 2013 9:21pm

Hi,

I want to ask some questions:

1. Whether the issue only occurs when sending emails to all the remote domains or only some specific remote domails?

2. Does this issue occur intermittently or it can be always reproduced?

Please try to telnet the target domain.

Thanks

Mavis

August 12th, 2013 5:24am

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