From: |
"Lewis G Rosenthal" <ecs-isp@2rosenthals.com> |
Full Headers Undecoded message |
Subject: |
Re: [eCS-ISP] Anyone else seeing issues today with AT&T and RDNS failures when sending? |
Date: |
Fri, 21 Feb 2025 14:15:13 -0500 |
To: |
eCS ISP Mailing List <ecs-isp@2rosenthals.com> |
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Hi...
On 02/20/25 05:11 pm, Steven Levine wrote:
In <list-12280221@2rosenthals.com>, on 02/20/25
at 03:35 PM, "Lewis G Rosenthal" <ecs-isp@2rosenthals.com> said:
Hi there,
Today, att.net rejected mail from us to one of their subscribers with a
550 5.7.1 error:
<recipient-address @ att.net>
host ff-ip4-mx-vip1.prodigy.net [144.160.159.21]
SMTP error from remote mail server after MAIL FROM:<sender from the
2rosenthals.com domain>:
550 5.7.1 Connections not accepted from servers without a valid
sender domain.flph829 Fix reverse DNS for 50.73.8.217
secmgr-va.2rosenthals.com
I get the same here
; <<>> DiG 9.11.37 <<>> -x 50.73.8.217
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 42869
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 512
;; QUESTION SECTION:
;217.8.73.50.in-addr.arpa. IN PTR
;; ANSWER SECTION:
217.8.73.50.in-addr.arpa. 3600 IN PTR secmgr-va.2rosenthals.com.
;; Query time: 246 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: Thu Feb 20 14:12:39 PST 2025
;; MSG SIZE rcvd: 92
A wed search for
"flph829"
results in a few hints that match your problem, but nothing recent.
Yeah, whatever it was (likely that particular server), a subsequent retry got the message through. Very odd, though. IAC, it was a good opportunity for me to just check to ensure that RDNS was indeed correct, because I never really look.
Thanks, and apologies, all, for the noise.
--
Lewis
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Lewis G Rosenthal, CNA, CLP, CLE, CWTS, EA
Rosenthal & Rosenthal, LLC www.2rosenthals.com
visit my IT blog www.2rosenthals.net/wordpress
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