DNS: A Record and PTR Record
I'm setting up my first e-mail server (Gentoo Linux w/postfix). The server is a self-managed box I rent from a company that sells rack space. But my name servers and registration are provided by another company.
Anyway, I'm going through an old copy of "The Book of Postfix" and trying to make sure my DNS configuration is all correct. The book says that my A RECORD should match my PTR RECORD, or there could be problems communicating with some e-mail servers.
I can dig my server's fqdn just fine, which is in the domain I bought from the company that handles the registration. However, if I dig -x to do the reverse lookup for the ip address, instead of that fqdn, I get an internal fqdn made up by the company that is taking care of my self-managed computer.
/As far as I know/ this hasn't caused any problems sending or receiving e-mail. But is this an issue that will need to be resolved? And if so, who should I be talking to? (My name server provider or my rack-space provider?)