Nathanael, I responded on the NANOG list also. Feel free to reach out to me directly, we'll see if we can sort it out.
-- Alex Brotman Sr. Engineer, Anti-Abuse Comcast x5364 ________________________________________ From: mailop <[email protected]> on behalf of Nathanael Cariaga via mailop <[email protected]> Sent: Wednesday, May 5, 2021 3:20 PM To: [email protected] Subject: [EXTERNAL] [mailop] Comcast contacts Hi, anyone from Comcast on this list? I have a few questions I wanted to verify with you. I noticed some Comcast servers are intermittently returning "550 5.1.0 Invalid sender domain (in reply to MAIL FROM command)" for emails coming from the same domain/servers. Greatly appreciated if you can reach back directly off the list. _______________________________________________ mailop mailing list [email protected] https://urldefense.com/v3/__https://list.mailop.org/listinfo/mailop__;!!CQl3mcHX2A!Wd3xIqPV2hiCrAT3XNBk4Qz4M6uQvSQzYySKrD4udcneJ2xP4YyNaurMPckTfuZBPeoy$ _______________________________________________ mailop mailing list [email protected] https://list.mailop.org/listinfo/mailop
