Hi, I'm wondering if cPanel or anyone else can clarify reverse DNS. The cPanel documentation is a bit spotty in some places, and I've seen bits and pieces about rDNS but not enough information to feel comfortable setting it up. Can someone please clarify: 1) Why do I need reverse DNS? 2) I've heard that it's a problem when e-mail is sent from the client IP, not the client domain. If this is true, is there any way to easily (hopefully automatically) set up rDNS for each client so their e-mail works properly? 3) Do I really need my data center's permission and/or cooperation to set up reverse DNS? 4) How do I set up rDNS, step-by-step? Thanks in advance!