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SBS 2003 and Exchange problem - mail is bouncing back when sent through ISP.

Last Modified: 2010-04-19
there's an SBS 2003 server at location 2 of a multi location / pretty autonomous business (location 2 is pretty independent of location 1).  Location 1 is home office and has a domain / email hosted by outside ISP (domain1.com).  location 2 uses the same company and has domain2.com.  their addresses are bob@domain2.com, etc.

but they check email at webmail.domain1.com.  mail to bob@domain1.com and bob@domain2.com show up in their outlook mailbox of bob@domain2.com

we set up pop connector to get email from ISP and is working good.  sending mail out through ISP gets:

There was a SMTP communication problem with the recipient's email server. Please contact your system administrator.
  <domain1.com #5.5.0 smtp;553 sorry, that domain isn't in my list of allowed rcpthosts (#5.7.1)>

do we need to rerun the internet and email wizard and send using domain1.com!?

Watch Question

Is this a repeat question?  I coulda swore I saw a comment by Sembee on this exact question earlier suggesting you contact your ISP.

This one is on us!
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DanKosterOwner, Technology Consultant

"that domain isn't in my list of allowed rcpthosts" sounds like another way of saying that they will not relay for you.  Are you sure you are using the right mail server for your ISP?  If you have a static IP, check your IP on the spam database at http://www.DNSStuff.com, if it doesn't have any rejects, start sending direct instead of sending via your ISP.  

You may also run the full DNS Report (http://www.DNSReport.com) to see if there are any other issues with that setup.  

Unless you are using the wrong outbound server as a smart host, it does sound like the problem lies with the ISP.
You might also want to note that your question is the #1 Time Tested Solution in the Exchange Server area.  See: https://www.experts-exchange.com/Networking/Email_Groupware/Exchange_Server/Q_20752351.html

Hope that helps.


Sorry for the cross post.  I was eager for the answer and wasn't sure where to get the answer the quickest.  I am making it a 20 popint question so I can close this out.  sorry!

FYI - the answer for us was the be sure our ISP installed a PTR record.

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