Tried a few random dns servers, one caught my attn: ; <<>> DiG 9.11.36-RedHat-9.11.36-7.el8 <<>> -x 204.9.77.40 @1.1.1.1
;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 39575 ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1 ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 1232 ; EDE: 22 (No Reachable Authority): (time limit exceeded) ;; QUESTION SECTION: ;40.77.9.204.in-addr.arpa. IN PTR ;; Query time: 4852 msec ;; SERVER: 1.1.1.1#53(1.1.1.1) ;; WHEN: Thu Feb 20 14:41:43 CST 2025 ;; MSG SIZE rcvd: 78 Pretty much 5 seconds then timed out. Tried a couple times and it did start working. So something seems wrong somewhere. Every other query I tried to other resolvers worked. -----Original message----- From:Rob McEwen via mailop <mailop@mailop.org> Sent:Thu 02-20-2025 02:23 pm Subject:[mailop] AT&T/Prodogy/Yahoo claims that my sending IP doesn‘t have rDNS, except it does! To:mailop@mailop.org; Starting earlier today (Feb-20-2025) AT&T/Prodogy/Yahoo started rejection my users' emails due to my sending-IP-address (204.9.77.40) allegedly not having rDNS, except it does! This is happening to emails sent to the email addresses hosted at the following domain names: prodigy.net bellsouth.net att.net And this error is ONLY happening when connecting to either 144.160.159.21 or 144.160.159.22 When my users emails route to their other IPs - 144.160.235.143 and 144.160.235.144 - those are not having any problems. And I'm not seeing any such "no PTR" or "no rDNS" rejection messages with any other email systems that my users send to - and I have very good telemetry on rejections of emails sent by my system. HERE IS THE ERROR THAT IS BEING RETURNED: 550 5.7.1 Connections not accepted from servers without a valid sender domain.flph830 Fix reverse DNS for 204.9.77.40 And other times, this error is returned: 451 4.1.8 Client IP address 204.9.77.40 does not resolve.flpd569.Fix reverse DNS.For more information email postmas...@prodigy.net <mailto:postmas...@prodigy.net> But every time I do rDNS lookups on 204.9.77.40, from all various systems, I consistently get this answered with "mail.invaluement.com" - so I can't get it to fail. (And it has RCrDNS since this hostname resolves back to this same IP address) I asked my IP provider is they are having any issues with rDNS queries getting answers - and they claim that they're not having any issues. Then I tried to email support addresses at AT&T/Prodogy/Yahoo, but they are also returning back with this same error. Anyone else having this issue? And suggestions? Is there anyone on this discussion list who is with AT&T/Prodogy/Yahoo and who can assist this? Thanks! Rob McEwen, invaluement _______________________________________________ mailop mailing list mailop@mailop.org https://list.mailop.org/listinfo/mailop
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