Exchange send on multiple IP's

Our exchange 2003 server is behind our firewall.

It sends mail through the firewall on one of our public IP addresses.

We have two mail domains. someone@domain1.org and someone@domain2.org

Which ever domain mail is being sent from, it uses the same public IP address.

We want it to send mail from domain1 using public IP address1 and send mail
from domain2 using public IP address2.

Is this possible? If so then how do you go about it. Thanks for any help on
this.

Sparky
sparky2112Asked:
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dfxdeimosCommented:
I am going to have to double check on this (and perhaps someone else could weigh in) but I believe that you would just have to create multiple SMTP Connectors in exchange that route the e-mail based on domain via one of  the two different IP addresses.
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sparky2112Author Commented:
I understand that I would have to create multiple SMTP connectors to the internet but what mechanism does Exchange use to determine how to route mail from user@domain1.org to SMTP connector1 using IP address1  -- ~~--  and  user@domain2.org to SMTP connector2 using IP address2....etc.

THANKS!
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dfxdeimosCommented:
Hmm... now that I look more into it, I don't think that the SMTP connectors have the capability that you are looking for.

Perhaps if you let me know WHY you are trying to do this I can think of some alternate method to get the desired results?
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sparky2112Author Commented:
What we are trying to do: We have one exchange server. We host several mail domains on it. Right now, all mail goes out one public IP address. If someone does a reverse lookup on mail they are receiving from us, it resolves to domain1.org. If the mail should be coming from domain2.org and someone does a reverse lookup, it will resolve to domain1.org and fails.
So mail does not get rejected as spam, we want to break this out and have each or our mail domains have it's own IP address that can be resolved to it in a reverse lookup. So, exchange needs to send mail from domain1 on IP address1 and so on.
Any suggestions would be appreciated.

Sparky
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dfxdeimosCommented:
An easier way for you to solve this issue would be to put PTR records on domain2.org, domain3.org, etc that points back to the IP address associated with domain1.org .

This is quite a common issue with mail servers and setting up a PTR record will cause all reverse DNS queries to resolve successfully to the IP address you specify.

Here is more info about PTR records:

http://www.zytrax.com/books/dns/ch8/ptr.html

If you contact whoever is hosting your external DNS they should know how to set these up.
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sparky2112Author Commented:
Talking with our ISP, they say that you can't have several domains, with different names, pointing to a single IP with a PTR record. Or any other record for that matter. For reverse lookups, it's one domain per one IP. Unless I'm miss understanding what you are saying, that's not going to work. Thoughts? Suggestions? Thanks for helping.

Sparky
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dfxdeimosCommented:
I am pretty sure you can.

Scenario:

DOMAIN1.COM
-------------------
MX Record = mail.domain1.com (A Record to 111.111.111.111)
PTR Record for mail.domain1.com = 111.111.111.111

DOMAIN2.COM
-------------------
MX Record = mail.domain2.com (A Record to 111.111.111.111)
PTR Record for mail.domain2.com = 111.111.111.111

DOMAIN3.COM
-------------------
MX Record = mail.domain3.com (A Record to 111.111.111.111)
PTR Record for mail.domain3.com = 111.111.111.111

If these are all self contained DNS zones then I don't see a problem with this configuration.

Perhaps someone else can chime in and let me know if I am off base?

You should also edit the question and include it in the DNS question zone.
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