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Email being delayed

Posted on 2011-02-14
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Last Modified: 2012-05-11
I have Small Business Server 2003 running exchange on a local domain (i.e. server.domain.local). I seem to be having an email issue sending email to one particular domain. I get the following delay message:

Final-Recipient: rfc822;xxx@xxxxx.com
Action: delayed
Status: 4.7.1
Diagnostic-Code: smtp;450 4.7.1 <server.domain.local>: Helo command rejected: Host not found
Will-Retry-Until: Tue, 15 Feb 2011 08:55:05 -0700
X-Display-Name: 'xxx@xxxxx.com'

My searches lead me to believe that the receiving email servers may be rejecting (or delaying) email from our domain because the reverse DNS cannot be resolved for the ".local" domain. We are currently using an outside service with DNS and MX records to the server using a ".com" FQDN. This has worked flawlessly for several years, and does not currently affect any other domain email is sent to. Is this a potential cause of the problem, and if so, how can I change the name that the Exchange server supplies in the SMTP header?
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Question by:rldewees
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Alan Hardisty earned 500 total points
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It sounds like the FQDN on your SMTP Virtual Server is either configured as internaldomain.local or domain.com and is not resolving properly.

Please have a read of my article and check your configuration:

http://www.experts-exchange.com/Software/Server_Software/Email_Servers/A_2427-Problems-sending-mail-to-one-or-more-external-domains.html

The FQDN can be found on your SMTP Virtual Server> Delivery Tab> Advanced Button and should be something like mail.domain.com and this address needs to resolve back to the IP Address that you are sending from in DNS externally from a remote server.

Alan
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by:rldewees
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When I open IIS Manager, I do not see the SMTP Virtual Server.
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by:rldewees
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Alan,

The SMTP FQDN seems to have been the culprit. I found the SMTP virtual server in ESM and change the name. Test emails to an external address show the SMTP sender as the correct address now.

Thanks for the help!!!
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