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SMTP Relay to Active Directory Site Failed

Posted on 2014-01-16
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Last Modified: 2014-02-17
Hi Experts,

Can you help me to solve the problem we are encountering regarding the error on the next hop domain " SMTP Relay to Remote Acrive directory site"  with error message " (451 4.4.0 DNS query failed. SMTPSEND.DNS.NonExistendDomain)"?

This is our scenario we have two active directory site for our organization the primary site A and the secondary site B. Our replication scenario is ACTIVE-PASSIVE, all mail flow should pass on the primary site. Both site has MX Record primary site has the highest priority while the secondary is the least. Our problem is if the primary site internet is busy and cannot respond immediately the next MX respond so the email will pass through secondary site and thats we encounter the error above. We already adjust all receive connectors.

Any idea on this?

Thanks,
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Question by:junyap
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LVL 63

Expert Comment

by:Simon Butler (Sembee)
ID: 39788121
Which version of Exchange is this?
Have you tried to configure external DNS servers on the Send Connectors?

Simon.
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Author Comment

by:junyap
ID: 39788145
This is exchange 2010.  What will I inp
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Author Comment

by:junyap
ID: 39788146
What will I input on the external DNS?
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Expert Comment

by:Simon Butler (Sembee)
ID: 39789548
That was what I was asking - do you have external DNS entries entered? If so you should remove them. Ensure the server is using AD servers for DNS and the DNS zone is up to date.

Simon.
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Author Comment

by:junyap
ID: 39791751
Hi Simon,

I haven't try this before to remove the external DNS entries on the HT. Can you explain the relation of removing the entry and pointing the DNS to AD to the smtp relay problem? Can I just add the IP of Dns server on the external dns entry?

Thanks,
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LVL 19

Expert Comment

by:compdigit44
ID: 39792910
I may be mistaken but it almost sounds like your DNS isn't setup correctly.

Are you using split brain DNS?

Could you upload a screen shot of your DNS setup.

Also the following link contains suggestion on the best ways to setup Exchange 2010 for site resilience.

http://www.msexchange.org/articles-tutorials/exchange-server-2010/high-availability-recovery/designing-site-resilient-exchange-2010-solution-part1.html
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Expert Comment

by:Simon Butler (Sembee)
ID: 39792993
How come you had external DNS entries in there anyway? They aren't normally required, so if you did need them that would indicate a problem with DNS lookups.

Simon.
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Author Comment

by:junyap
ID: 39799149
Hi,

We have two Exchange organization. The one is with domain company.local and the other is company.com.ph That was I first thought the split brain syndrome but it also happen to my other organization where the local domain name and external domain name is the same. Also I check one of the Technet before I configure the Send connector. See link below:

http://social.technet.microsoft.com/Forums/exchange/en-US/a093f75f-c227-4c86-b779-7a732b378a5d/effect-of-using-external-dns-setting-in-send-connector-properties-e2k7?forum=exchangesvradminlegacy

Thanks,
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LVL 19

Expert Comment

by:compdigit44
ID: 39799846
Did you check the remote site for Certificate errors? Do you have any ant-spam installed on our HUB servers? Did you check both MX records to make sure they are not blacklisted.
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Author Comment

by:junyap
ID: 39801801
Hi,

Yes thats my initial checklist when we are building exchange org. I do not think MX record will cause this since it only inside the organization and the messages that queues is from inside account when secondary site HT is trying to relay the messages to primary site.

Thanks,
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LVL 19

Expert Comment

by:compdigit44
ID: 39802977
The following article has some great tips for setting up Exchange 2010 with multi sites..

http://www.danieldainty.com/blog/tech/microsoft/server/exchange/designing-a-site-resilient-exchange-2010-solution/
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Accepted Solution

by:
junyap earned 0 total points
ID: 39855473
Hi,

For now since my architecture is active-passive, i temporary prevent the DR site to mailbox servers to host or activate any databases by setting them as "intrasite".

Thanks,
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Author Closing Comment

by:junyap
ID: 39864348
Cannot apply recommended solution since organization is on production.
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