Hi, Final rDNS server of reversedns.vultr.com has the zone improperly configured (serving from in-addr.arpa. instead of 203.138.155.in-addr.arpa.) which violates RFC 1034 section 4.2.2. I'm not saying that's Google's problem with you, but with strict enough checking it definitely can be a policy violation.
On top of that, the parent NS also has the zone delegated as 148.203.138.155.in-addr.arpa instead of 203.138.155.in-addr.arpa which is also an incosistency. --Endre On Thu, Nov 27, 2025 at 10:26:10+0000, ml+mailop--- via mailop wrote: > Does google have broken DNS resolvers? > > 550-5.7.25 [155.138.203.148] 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 match the sending IP. As a policy, Gmail does not accept messages > 550-5.7.25 from IPs with missing PTR records. For more information, go to > 550-5.7.25 https://support.google.com/a?p=sender-guidelines-ip > 550-5.7.25 To learn more about Gmail requirements for bulk senders, visit > 550 5.7.25 https://support.google.com/a?p=sender-guidelines. > 00721157ae682-78ad0d509c9si5517897b3.115 - gsmtp > > dig +short -x 155.138.203.148 > veps.esmtp.org. > dig +short veps.esmtp.org > 155.138.203.148 > > If it would be a temporary problem at their side would they > at least generate a 4xy reply? > _______________________________________________ > mailop mailing list > [email protected] > https://list.mailop.org/listinfo/mailop _______________________________________________ mailop mailing list [email protected] https://list.mailop.org/listinfo/mailop
