Do Multiple domains, require multiple public ip address for PTR Records ?

Good Morning everyone...

I recently added 2 new domains to my exch 2007 server.

When I called my ISP to add the PTR records for these domains, they said I had to have a unique ip address for each domain, and I would need 3 public ip address for the 3 different domains on my domain.

Does this correct to everyone?

If it is correct, how do I force exchange to send email for a certain domain from a certain ip address..  


I appreciate all of your help,
Liam
paadminAsked:
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SembeeCommented:
As you can't get Exchange to send email through different routes depending on the address being sent, adding additional IP addresses and reverse DNS records is a pointless exercise.

What I usually suggest is that you simple change the MX records of the new domains to match the existing MX records.

For example, if you existing domain is domain1.com and your MX record is mail.domain1.com with a cost of 10, then for the second domain, domain2.net you would set the MX records to be mail.domain1.com with a cost of 10.

The MX record does NOT have to be in the same domain that it is serving, it just needs to resolve. It also cannot be a CNAME, it needs to be a host, so using the same host name for all domains is fine.

Simon.

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Yancey LandrumTechnical Team LeadCommented:
Absolute rubbish. Your ISP is wrong. If your existing MX record looks like this:

IN    MX    10 currentdomain.com
IN    MX    100 backupspool.com

Then the two new domains would need MX records like this:

New domain 1:
IN    MX    10 currentdomain.com
IN    MX    100 backupspool.com


New domain 2:
IN    MX    10 currentdomain.com
IN    MX    100 backupspool.com
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Yancey LandrumTechnical Team LeadCommented:
I really should learn to refresh if my answer has been sitting for a while...sorry about that, Sembee.
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SembeeCommented:
But yours was so nicely formatted....

Simon.
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paadminAuthor Commented:
Thanks you both for your help, This forum is awesome, it has helped me so so much..  

Now how do I award points :)  

Does 250 each sound o.k. Simon was first bus a second opinion is alwasys welcomes (although I've never needed it with Simon)...

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Yancey LandrumTechnical Team LeadCommented:
Your call; I'm not here to amass huge amounts of points. I usually have no trouble getting the minimum needed to maintain my free account :)

In all fairness, Simon answered first, and also covered the PTR portion of your question, which I did not. All I did was basically say "Yeah, what he said!"
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paadminAuthor Commented:
Hey ylandrum, thanks for being so gracious.. Simon gets the point with a great honorable mention to ylandrum :)

Thanks guys,
Liam
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