Mailing List ecs-isp@2rosenthals.com Archived Message #1150

Fra:	Paul Smedley	Full Headers Undecoded message
Emne:	Re: [eCS-ISP] Anyone else seeing issues today with AT&T and RDNS failures when sending?
Dato:	Fri, 21 Feb 2025 07:26:41 +1030
Til:	eCS ISP Mailing List

Hey Lewis, On 21/2/25 07:05, Lewis G Rosenthal wrote: 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. Confirmed also that rdns works for your IP from the other side of the planet.. psmedley@ThinkPad-X13-Gen-1:~$ host 50.73.8.217 217.8.73.50.in-addr.arpa domain name pointer secmgr-va.2rosenthals.com. Cheers, Paul

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