User sends me a mail message that bounced back:
(reason: 554 5.7.1 While validating PTR record for 1.2.3.53, the hostname it resolves to (mail.my.domain) does not resolve back to 1.2.3.53. Please have your system administrator fix your DNS records.)
The reason: we have two Internet connections and the firewall will send packets out on whichever connection seems best at the time. Obviously, each connection is on a different (/28) subnet. So, I created PTR records for both 1.2.3.53 and 1.2.3.197 to resolve to mail.my.domain. But, the A record for mail.my.domain only points to 1.2.3.197 (though we can quickly switch it to the other if we need to).
My understanding is that this is a perfectly legitimate setup. While it is true that an A record should have a matching PTR record, there is no requirement that a PTR record matches the A record.
So, can I tell these guys where to stick it? Or am I the one who is wrong? |
