Comcast mail contact

Brotman, Alex Alex_Brotman at
Wed May 5 19:32:18 UTC 2021


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

> -----Original Message-----
> From: NANOG < at> On
> Behalf Of Nathanael Cariaga
> Sent: Wednesday, May 5, 2021 2:18 PM
> To: NANOG <nanog at>
> 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.

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