Exchange 2010 bounce back messages

We recently installed an exchange 2010 server I am now getting alot of bounce back messages from some people here at work. The messages says its a RDNS issue from an IP that is NATed over for people going out to the web. Our MX records are all set and i have set the IP address is says it cant RDNS in my DNS records both internally and External. Still no luck any ideas? The DNS entry I made was for the IP and the domain name not sure if that is correct.
wcodyAsked:
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Manpreet SIngh KhatraConnect With a Mentor Solutions Architect, Project LeadCommented:
Humm .... when did you make the changes ?
Was both MX an dPTR changed to the new server ?
Is there any firewall as well ? If yes is that the first point of contact for the External email ?

- Rancy
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Dimitris IoakimoglouNetwork AdministratorCommented:
First off, I need to ask you to clear things up a little bit.

You introduced a new mail server to your domain.

Does your whole network connect to the internet via a single IP? Do you work your server with port forwarding?
Have you created a PTR record for your mail server -or have you asked your ISP to do so for you? (depends on the case)
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Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
What is your MX pointing to ? is there a PTR created for it ?

Some Organizations look for a reverse PTR for your MX.

- Rancy
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Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
MX and PTR ideally are created with the ISP ..... also this takes about 24-72 hours to get updated on all Internet DNS servers .... if you have already done ... the only thing you have to now do is wait for updates to happen and things to calm down.

- Rancy
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wcodyAuthor Commented:
All of our servers are Nat'ed over individually however our users go out over one IP address and that is the one they are saying is the RDNS issue. Our MX records are pointing to the server we have up for exchange. As far as PTR in our exchange we do have a record in our reverse look up in the external dns
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Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
So MX points to the Server that sends email to internet ? Is this a Firewall or HUB\EDGE ?
Is there a PTR created with ISP for this ?

- Rancy
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wcodyAuthor Commented:
Rancy that would be yes for the first part. and yes for the second part. Well we run our own external DNS I just find this odd since i never really had an issue with exchanger 2k3 with this .
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