[exim] Weird error showing up in mainlog

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Author: The Doctor
Date:  
To: exim-users
Subject: [exim] Weird error showing up in mainlog
For the first time today I am seeing

2017-11-23 13:00:00 1eHxbt-0008Sf-2W ** {legit e-mail address} R=dnslookup T=remote_smtp H=doctor.nl2k.ab.ca [204.209.81.1] X=TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256 CV=no: SMTP error from remote mail server after pipelined MAIL FROM:<root> SIZE=13880523: 501 <root>: sender address must contain a domain

What is happening?

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Member - Liberal International This is doctor@@nl2k.ab.ca Ici doctor@@nl2k.ab.ca
Yahweh, Queen & country!Never Satan President Republic!Beware AntiChrist rising!
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Happy Christmas 2017 and Merry New Year 2018