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Mike Hammett
Intelligent Computing Solutions
http://www.ics-il.com

Midwest-IX
http://www.midwest-ix.com

From: "Nathanael Cariaga" <ncariaga@gmail.com>
To: "NANOG" <nanog@nanog.org>
Sent: Wednesday, May 5, 2021 1:17:46 PM
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.