PTR Problem with static IP?
I have several static IP addresses from comcast. The one that I am having an issue with is (removed for account security).
Comcast has previously created a PTR record for this address that resolves to bitbrothers.com.
I host the A record for bitbrothers.com and it resolves to (removed for account security).
When I do IP lookups for that address using comcast or google servers, they resolve as I expect. Everything has been working fine for several years.
Roughly 2 months ago, "something" changed. When I send e-mail from that server, it no longer appears to be coming from (removed for account security). It NOW appears to be coming from an IPv6 address.
This is the relevant line from the e-mail headers:
Received: from bitbrothers.com ([2601:5:c680:8600:20c:29ff:fe9b:16d7])
This is causing a problem as the comcast mail servers will not accept e-mail from servers that are not configured with correct PTR records and that IPv6 address does not resolve to bitbrothers.com.
I would like to understand what has changed and why it only affects my e-mail traffic as opposed to web and other traffic. What sort of network kung-fu do you have going on?
Ideally, "something" would change back to the previous behavior and mail would appear to come from (removed for account security)again (along with my other (removed for account security) IP addresses). Otherwise, I will need to know what options I have from comcast. (Presumably you can set the IPv6 address to resolve to bitbrothers.com as well but I will have to make additional changes on the mail server or dns server to support whatever is happening.)
Thank you for helping with this. I apologize if I am unclear. I can provide additional information if needed.