Multiple Domains + mail server host greeting name

Morning!

I have an Exchange Server 2003 which hosts 2 email domains (@domainA.com & @domainB.com).  

DomainA is our company's email account and DomainB is our hosted companies email account.  I had a feeling this would happen, when I did a DNS REPORT on it I received a warning that the "mail server host greeting name" is not mis-representing itself, i.e., the greeting host is showing as DomainA's MX record.  I have the proper MX records, mail.domainA.com & mail.domainB.com including proper r-dns records.  Can you "fudge" exchange so that it properly reports both MX records in the mail greeting host??

TIA,

Steve
sdeblockAsked:
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diepesConnect With a Mentor Commented:
2 email domains (@domainA.com & @domainB.com).  

Quote
>>warning that the "mail server host greeting name" is not mis-representing itself
why NOT mis-representing itself ?  surely you mean mis-representing itself ?

As to the answer.
A mail server can receive email from multiple domains if there mx records point to it.
The solution is NOT to use 2 different dns names for the different domain email servers, but the same

e.g.
For domainA.com    have a mx record    mail.domainA.com
and for domainB.com have a mx record  mail.domainA.com     <<A again.

Both should point to the same domain, and the reverse lookup for the ip should also point to mail.domainA.com

Then the problem is solved.
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LuisDoBenficaCommented:
Hello,

It seems that your Exchange Server is Internet Front.

You should install a SMTP gateway between Internet and your Exchange server (eq. Linux with Postfix) and modify the MX (on Internet) for all domains you host to point to your SMTP gateway.
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Lee W, MVPTechnology and Business Process AdvisorCommented:
Came across this recently in a group I'm a part of... not sure if it's what you're looking for:
Under the SMTP Connector go under Properties and on one of those tabs there is an Advanced button revealing a field where you can change the name to mail.yourcustomer.com
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sdeblockAuthor Commented:
Thanks for your responses.

It seems as though I have the server created correctly with proper RDNS and MX records.  I was worried that outbound email from DOMAINB would have issues with some mail servers if it was responding with a mail server greeting name of DOMAINA.

Per DIEPES last reponse, that's the exact configuration I have now.

Please let me know if you have any other thoughts - thanks!
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diepesCommented:
you can read up on SPF  sender policy frame work, that is a way to add dns records for domainA and domainB that appoints your mail server as a legitimate sender for both of these domain.

But is is not used/checked widely by mail servers.

http://www.openspf.org/
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