SMTP Relay to Active Directory Site Failed

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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junyapAsked:
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junyapConnect With a Mentor Author Commented:
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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Simon Butler (Sembee)ConsultantCommented:
Which version of Exchange is this?
Have you tried to configure external DNS servers on the Send Connectors?

Simon.
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junyapAuthor Commented:
This is exchange 2010.  What will I inp
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junyapAuthor Commented:
What will I input on the external DNS?
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Simon Butler (Sembee)ConsultantCommented:
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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junyapAuthor Commented:
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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compdigit44Commented:
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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Simon Butler (Sembee)ConsultantCommented:
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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junyapAuthor Commented:
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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compdigit44Commented:
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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junyapAuthor Commented:
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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compdigit44Commented:
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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junyapAuthor Commented:
Cannot apply recommended solution since organization is on production.
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