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SMTP Communication problems with Exhange and MS CRM

Posted on 2006-07-24
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Last Modified: 2012-05-05

My Exchange server sends emails without issue, however, when sending from our MS CRM app, I get this error:

 There was a SMTP communication problem with the recipient's email server.  Please contact your system administrator.
            <companyname.com #5.5.0 smtp;521-EHLO/HELO from sender xxx.xxx.xxx.xx does not map to companyname.com in DNS>

I am not sure what is going on here...
our mail server (mail.companyname.com) url is at xxx.xxx.xxx.xx, but companyname.com is not - so that is likely the issue. But how is this corrected?
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Question by:dbrennecke
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Sembee earned 150 total points
ID: 17172086
They are doing a reverse lookup on the SMTP banner.

ESM, Servers, <your server>, Protocols, SMTP. Right click on the default SMTP VS and choose Properties. Click on the tab Delivery and then Advanced. In the middle is FQDN. It probably says companyname.com - change it to mail.companyname.com and apply/ok out.

Simon.
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Author Comment

by:dbrennecke
ID: 17327030
Simon,
Sorry for the delay on this... my SMTP protocol does have mail.companyname.com. However, clicking on the CHECK DNS button identifies that it is not valid. BTW, I do have a reverse DNS setup for the address.
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Expert Comment

by:Sembee
ID: 17328822
Check DNS often doesn't work, and if you are in a single server/site environment you can ignore that.
If you put your domain in to dnsreport.com - does it flag any errors, particularly in the mail server configuration?

Simon.
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Author Comment

by:dbrennecke
ID: 17328878
Thanks for that info Sembee... dnsreport.com seems fine with my domain.
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Expert Comment

by:Sembee
ID: 17335812
Are you still getting errors when you send email then?

Simon.
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Author Comment

by:dbrennecke
ID: 17336242
yes...
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Expert Comment

by:Sembee
ID: 17337364
If you telnet to your Exchange server, does the Exchange server announce itself as domain.com or mail.domain.com?

Does your email go out directly or through another machine? An appliance perhaps or other smart host.

Simon.
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