PTR For IPV6
We have the Comcast EDI (Internet). We use a static IPV4 address for our Exchange mail server. We have the appropriate DNS/PTR records for the IPV4. Our Exchange and email have been working normally for a few years now. Our EDI (dedicated fiber Internet) has also been good for a few years. So our environment - email and Internet - all good for quite some time.
Today we are getting bounced messages sent from Exchange to Google mail users. The message is stating that - Our system has detected that this message does not meet IPv6 sending guidelines regarding PTR records - and before the message text it references an IPV6.
I think Comcast needs to enter a PTR record for the IPV6 - even though we use a static IPV4. Their support seems confused and is saying it could take days. I am not convinced they understand the issue.
Additionally - If I Google - what is my IP - some sites are showing an IPV6 and some show my expected IPV4 WAN address.
Does anyone have any insight on this?