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451 4.4.0 Primary Target IP address responded 421 4.2.1 unable to connect.
Hello Experts:
I am running Exchange 2007: I have a problem with sending email to a customer with the messages getting stuck in the que: The error message says: 451 4.4.0 Primary Target IP address responded 421 4.2.1 unable to connect. Attempted failover to alternate host, but that did not suceed. Either there are no aternate hosts or delivery failed to the all alternate host.
Does this message indicate a problem on my end or the customer's end? All other mail from my mail server is going out and in with no other problems.
Thanks for the help.
I am running Exchange 2007: I have a problem with sending email to a customer with the messages getting stuck in the que: The error message says: 451 4.4.0 Primary Target IP address responded 421 4.2.1 unable to connect. Attempted failover to alternate host, but that did not suceed. Either there are no aternate hosts or delivery failed to the all alternate host.
Does this message indicate a problem on my end or the customer's end? All other mail from my mail server is going out and in with no other problems.
Thanks for the help.
ASKER
Hello Sembee:
I called our customer and he says he has been getting emails from other people. Any other ideas would be welcomed. I ran the mail flow Trouble shooter and I get the problem of Domain onealsteel.com is remote domain to which commserver1 is possibly having trouble routing messages through a smpt connector. Another problem is The pointer record localhost does not match any FQDN of the SMTP instances on server commserver1. This may cause routing problems when remote servers have a filter to map an IP address to a server name.
I have checked the dns settings and see the a record for the commserver1 and its associated pointer--I am puzzled. Any ideas is appreciated.
I called our customer and he says he has been getting emails from other people. Any other ideas would be welcomed. I ran the mail flow Trouble shooter and I get the problem of Domain onealsteel.com is remote domain to which commserver1 is possibly having trouble routing messages through a smpt connector. Another problem is The pointer record localhost does not match any FQDN of the SMTP instances on server commserver1. This may cause routing problems when remote servers have a filter to map an IP address to a server name.
I have checked the dns settings and see the a record for the commserver1 and its associated pointer--I am puzzled. Any ideas is appreciated.
ASKER
Also another issue surface in the troubleshooter was Port 25 did not repond on server mail.onealsteel.com. Unless the SMTP port has not been changed on server mail.onealsteel.com mail flow problems will occur.
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ASKER
Thank you, Sembee...you are the best. I wished I had half of your knowledge! I will keep pressing them.
I am having the same problem with multiple domains. How can I tell if they are a message labs customer?
I just wanted to add to this post that our we added our server container in AD to our McAfee EPO and the policy for preventing mass mailing worm blocked port 25. We added the exception and all is well again.
So, check to make sure antivirus or firewall is not blocking port 25.
So, check to make sure antivirus or firewall is not blocking port 25.
*sends one fit blonde to Sembee*
Sembee = Awsome
Simon.