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Can't Send Email to Certain Domain

By Working IT ·
Running Exchange 2k3 on a W2k3 server.

I am having problems sending email to certain domain. Receiving emails from them is no problem. I only have problem sending to them.

I enabled the Logging on my SMTP Virtual Server. There is one thing in command on all these domain I can't email to. They all gave me an error of "command line too long." One error message said " 421 5.5.2 Syntax error (command line too long)." Another one said " 500 Command line too long."

Please help!

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by gpartridge In reply to Can't Send Email to Certa ...

The issue could be with the other mail server trying to perform reverse dns lookups on your mx record. Do you have a ptr record for your mx record that points to the IP of your mail server? If not you may need to relay mail through your ISP's mail server to resolve the issue.

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by Working IT In reply to

Works after I use my ISP as the smart host. Thanks

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by Working IT In reply to Can't Send Email to Certa ...

Checked with my ISP. Not problem with the Reverse DNS Setup.

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by Working IT In reply to Can't Send Email to Certa ...

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