Dalmango wrote: ↑
Sat Sep 16, 2017 5:33 pm
Thanks Tim, there's something up because this has only happened since playing around with postfix.
I really think it's from sending an email and the recipient client doing a reverse lookup as I've watched countless tutorials and a way of filetering spam was to reverse look up and see if the email being sent ip address matched the domain registration ip address. It's 100% something since messing around with postfix as my ip was fine at first.
What do you mean "...as my ip was fine at first"?
What do you mean "...there's something up because this has only happened since playing around with postfix. "?
Many email servers do not have the same IP as the domain IP, and some not even the mx record. My ISP uses two servers. One sends and one receives. The sender is not the mx record.
Do you have a static IP where your email server is? If not, and you get a dynamic IP, that is most likely the problem. BTW, I ran my own email servers for years. This is not my first rodeo.