<html><head><style type='text/css'>p { margin: 0; }</style></head><body><div style='font-family: arial,helvetica,sans-serif; font-size: 10pt; color: #000000'><font face="arial, helvetica, sans-serif"><span style="font-size: 13.3333px;">https://list.mailop.org/listinfo/mailop</span></font><br><br><div style="color: rgb(0, 0, 0); font-family: arial, helvetica, sans-serif; font-size: 10pt;"><span name="x"></span><br><br>-----<br>Mike Hammett<br>Intelligent Computing Solutions<br>http://www.ics-il.com<br><br>Midwest-IX<br>http://www.midwest-ix.com<span name="x"></span><br></div><br><hr id="zwchr" style="color: rgb(0, 0, 0); font-family: arial, helvetica, sans-serif; font-size: 10pt;"><div style="color: rgb(0, 0, 0); font-family: Helvetica, Arial, sans-serif; font-size: 12pt; font-weight: normal; font-style: normal; text-decoration: none;"><b>From: </b>"Nathanael Cariaga" <ncariaga@gmail.com><br><b>To: </b>"NANOG" <nanog@nanog.org><br><b>Sent: </b>Wednesday, May 5, 2021 1:17:46 PM<br><b>Subject: </b>Comcast mail contact<br><br>Anyone from Comcast on this list? would appreciate if you can reach<br>out off the list. Have a few concerns regarding Comcast servers<br>intermittently throwing 550.5.1.0 -- invalid domain errors.<br></div><br></div></body></html>