@Alex Papadimoulis said:
This DNS stuff is way over my head. Should I change anything?
If your upstream does your DNS for you, and if they are even halfway competent, all you need to say is “give me matching forward/reverse DNS for my mailserver”. They ought well understand what you are talking about; if they don’t, they should not be in the business of providing Internet services.
In lieu of time to write up a coherent explanation, a quick glance with $SEARCH_ENGINE
produces the following:
- http://tools.ietf.org/html/rfc1912#section-2.1
- http://www.dnsstuff.com/docs/ptr
- http://postmaster.aol.com/Postmaster.FAQ.php
(Scroll down; I don’t see fragment identifiers in the HTML.) - http://www.simpledns.com/kb.aspx?kbid=1052
I am not affiliated with any of these sites; and I only briefly skimmed their explanations for general signs of cluefulness and/or usefulness. I also skimmed over some disastrously bad advice, e.g., saying that you need separate IP addresses and PTR records set up for each of your virtual hosts at which you have mail aliases (!). At the bottom line, all you need is for forward DNS, reverse DNS, and HELO/EHLO
on your mailserver to all agree with each other; the actual addresses you are sending and receiving at are irrelevant.
[Edit: Added nofollow
link to identify persons guilty of bad advice.]