RE: Comcast mail contact

["Brotman, Alex via NANOG" <nanog () nanog org>]

Nathanael,

You can reach out to me privately if you'd like.  Typically those are related to DNS being unable to resolve an 
MX/A/AAAA for your 5321 Mail From domain, but I can take a better look to be sure.

--
Alex Brotman
Sr. Engineer, Anti-Abuse & Messaging Policy
Comcast

> -----Original Message-----
> From: NANOG <nanog-bounces+alex_brotman=comcast.com () nanog org> On
> Behalf Of Nathanael Cariaga
> Sent: Wednesday, May 5, 2021 2:18 PM
> To: NANOG <nanog () nanog org>
> Subject: Comcast mail contact
>
> Anyone from Comcast on this list?  would appreciate if you can reach out off the
> list.  Have a few concerns regarding Comcast servers intermittently throwing
> 550.5.1.0 -- invalid domain errors.