Anyone else seeing issues today with AT&T and RDNS failures when sending?
Data:
Thu, 20 Feb 2025 15:35:25 -0500
A:
eCS-ISP <ecs-isp@2rosenthals.com>
Hi, all...
It's rare that I get an RDNS failure for one of my server IPs, as I know I have (and have just confirmed again) valid RDNS records in my providers' DNS.
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
50.73.8.217 is our Leesburg, VA public IP on Comcast's network (I know; I'm so ashamed...we're in the only four square blocks in downtown Leesburg where Verizon FiOS is *still* not available). The RDNS record is:
secmgr-va.2rosenthals.com
(verified a few minutes ago at MX-Toolbox)
I'm wondering if anyone else is having difficulty today.
TIA
--
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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