On 2/16/22 16:40, Sinclair, John via mailop wrote:
Valid email (supposedly) from petvetcarecenters.com to drew.q.tay...@gmail.com <mailto:drew.q.tay...@gmail.com>, and it got delivered to MY domain (mspca.org)…

Sorry in advance if this violates any of the list’s rules, but here’s the header in full – do I have something very misconfigured?

The simple and likely explanation as to why you received the messages is that your address was in the Bcc: field, this seems to be the header from the ingress point:

Received: from us-smtp-delivery-145.mimecast.com (us-smtp-delivery-145.mimecast.com 
[170.10.129.145]) by smtp.mspca.org with ESMTP id cGBcexMi1gACFRR2 (version=TLSv1.2 
cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NO) for 
<jsincl...@mspca.org>; Wed, 16 Feb 2022 08:31:07 -0500 (EST)
So my educated guess is that this particular incident is not down to a misconfiguration on your part.

However, the data do not tell us whether you could have other gremlins lurking in your configuration ;P

All the best,
Peter N. M. Hansteen

--
Peter N. M. Hansteen, member of the first RFC 1149 implementation team
http://bsdly.blogspot.com/ http://www.bsdly.net/ http://www.nuug.no/
"Remember to set the evil bit on all malicious network traffic"
delilah spamd[29949]: 85.152.224.147: disconnected after 42673 seconds.
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