Thanks, Artie. I used that marine-(etc.) name as a domain name, and the webmail site accepted it (it had rejected previous attempts that lacked @ something, but I hadn't tried this one). I set up a rule in Mail about this, so time will tell.

In the meantime, I took a look at some more info, but this time in Entourage. I have deleted my wife's email address. Maybe someone can interpret it:

Return-Path: <>
Received: from dnvrco-cmimta11 ([107.14.174.244])
by cdptpa-fep23.email.rr.com
(InterMail vM.8.04.03.24 201-2389-100-172-20151028) with ESMTP
id <20191130192143.QSPY7310.cdptpa-fep23.email.rr.com@dnvrco-cmimta11>
for <deleted by jchuzi>; Sat, 30 Nov 2019 19:21:43 +0000
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Reply-to: <doxanam1@gtin.matarovilla.icu>
Return-Path: <>
Return-Path: <deleted by jchuzi>
Return-Path: return@insidtimes.net
Return-Path: <return@kalnearshow.club>
Sender: marine-embassy-guard-association.promo4u.pro
Subject: =?UTF-8?B?SGF2ZSB5b3Ugb3IgYSBsb3ZlZCBvbmUgZGV2ZWxvcGVkIGNhbmNlciBhZnRlciB1c2luZyBSb3VuZHVwIHdlZWQga2lsbGVyID8/?=
To: deleted by cyn
Date: Mon, 21 Dec 2899 23:59:59 +0000 (EDT)
From: =?UTF-8?B?LSBBRyBBdHRvcm5leXM=?= <PEytBzf@zabiton.com>
Content-Type: text/html
X-CMAE-Envelope: MS4wfAbD02SfagEgVE4HlOVjT2LeyeSVvWq6QJc0gu/M2qcsi+qUefXGz8UyXkIjidpS91tUsY5lLc3wzaxo5nALkYCQUXjzJl9a7H4q1ArJD+66sIglEwjp
9+PWLOOOFIruoi0QJ2FRBrtb36rXH/VDKpRpnoihn6xx1E+P/UJuU8Qj
Message-Id: <20191130192143.QSPY7310.cdptpa-fep23.email.rr.com@dnvrco-cmimta11>

Last edited by cyn; 12/01/19 12:48 AM. Reason: Deleted the "To" address.

Jon

macOS 11.7.10, iMac Retina 5K 27-inch, late 2014, 3.5 GHz Intel Core i5, 1 TB fusion drive, 16 GB RAM, Epson SureColor P600, Photoshop CC, Lightroom CC, MS Office 365