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Possible Solution for testing...<br />
<a href="http://www.msexchange.org/tutorials/order-which-Exchange-2003-SP2-Connection-Filters-applied.html" rel="ugc">http://www.msexchange.org/tutorials/order-which-Exchange-2003-SP2-Connection-Filters-applied.html</a>
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Possible Solution for testing...
http://www.msexchange.org/tutorials/order-which-Exchange-2003-SP2-Connection-Filters-applied.html [http://www.msexchange.org/tutorials/order-which-Exchange-2003-SP2-Connection-Filters-applied.html]

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Have you checked your firewall or antispam filter?<br />
<br />

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Have you checked your firewall or antispam filter?



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Ok just a little help...What am I checking for specifically...Mail goes out and comes back to as normal for 90 to 95 percent of the recipients I send to ...Just this new one that has come up recently...is giving me a problem....
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Ok just a little help...What am I checking for specifically...Mail goes out and comes back to as normal for 90 to 95 percent of the recipients I send to ...Just this new one that has come up recently...is giving me a problem....

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Does your ISP also have an MX record pointing at the Exchange server?<br />
<br />
You also might want to look at disabling the anti-virus/anti-spyware software on the server, just in case.<br />

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Does your ISP also have an MX record pointing at the Exchange server?

You also might want to look at disabling the anti-virus/anti-spyware software on the server, just in case.


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my external FQDN is simmspc.com however internally, my domain is simmspc.local...It has not been a problem up until now...
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my external FQDN is simmspc.com however internally, my domain is simmspc.local...It has not been a problem up until now...

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What the solution suggests is already configured in Exchange on my server. 
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What the solution suggests is already configured in Exchange on my server.

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How do I fix a HELO/ EHLO domain invalid error on Exchange 2003 server. &nbsp;The message said that my message was blocked because the Helo/ Ehlo domain is invalid...My ISP has an A record in their dns that points to my domain. &nbsp;There is also a reverse ptr. Any ideas...
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How do I fix a HELO/ EHLO domain invalid error on Exchange 2003 server.  The message said that my message was blocked because the Helo/ Ehlo domain is invalid...My ISP has an A record in their dns that points to my domain.  There is also a reverse ptr. Any ideas...

HELO/ EHLO domain invalid error on Exchange 2003 server

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

The Domain Name System (DNS) is a hierarchical, globally distributed system responsible for associating the name of a computer, service or other resource into an IP address for connecting to the Internet or a private network. Most prominently, it translates domain names to the numerical IP addresses needed for the purpose of computer services and devices worldwide.