I am a bit confused as to what my DNS settings should be for hosting my Exchange server. At this point, we are hosting Exchange, and all seems to be working well, but I have never setup reverse DNS for our domain. The reason is the website the domain is hosted on is different then where we host the Exchagne server. For example; Website for mydomain.com is 65.10.x.x (Competely fabracated IP) mX record for mail@mydomain.com is 99.100.x.x (again, completely fabracated IP) How will setting up the reverse DNS for mydomain.com to point to 99.100.x.x rather then 65.10.x.x affect both email and normal web browsing to the website? I have a belief that we are losing emails, although I have not heard of any issues where end users are telling me an email is not arriving. I don't think the normal web browsing would be affected, as this usually doesnt use reverse DNS, but since I'm not sure, that is why I am asking. thanks all for the sage advice.

Emails you send may not get received due to spam filtering at the remote end if your DNS is not properly setup. You should have valid reverse DNS for your email server IP, otherwise your email will be rejected by AOL, Comcast, to name a few. The IP of your web server doesn't matter. Here's some things you should verify: You have an A-record for your email server pointing to it's Internet IP: mail.yourdomain.com -> xx.yy.zz.ww Your lowest-preference MX record needs to point to your email server A-record: Preference 10 -> mail.yourdomain.com The external IP address of your email server should resolve, with reverse DNS, to whatever Fully Qualified Domain Name your SMTP server advertises itself as when it sends mail. That would be your external FQDN in your send connector in Exchange2007, or the FQDN in your SMTP virtual server for Exchange2000/20003. If you cannot get your IP address reverse DNS to resolve to your server FQDN, it needs to at least resolve to something. Most ISPs will have it resolve to xx-yy-zz-ww.yourisp.com The forward DNS parameters are essential for you to receive email. The reverse DNS is important for your sent mail to not get rejected by spam filtering on the receiving end. Hope this helps, - Dustin