I recently setup a MIAB server. I tried sending an email to a gmail address today and it got returned. Here is what I got back.
“host gmail-smtp-in.l.google.com[xxx.xxx.xxx.xxx] said:
550-5.7.25 [xxx.xxx.xxx.xxx] The IP address sending this message does not have
a 550-5.7.25 PTR record setup, or the corresponding forward DNS entry does
not 550-5.7.25 point to the sending IP. As a policy, Gmail does not accept
messages 550-5.7.25 from IPs with missing PTR records.”
What is a PTR record and how do i set that up in MIAB?