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I have three mail users. Each successfully send and receive mail.

There is a single repeated problem email, a Web Form Notification sent from an Amazon server which is sent to all three mail users. Sendmail receives for one user and skips the other two. This problem has occurred only on this Web Form Notification mail from Amazon. I sent My Own Test Notification which was successfully received in all three mail boxes. See mail headers and mail.out logs below.

Question

Why did the Web Form Notification deliver to only one user while My Own Test Notification delivered to all three?

Web Form Notification - Header

From 01010187719db599-3ea881ca-830d-4456-8616-e6b9369fc482-000000@us-west-2.amazonses.com Tue Apr 11 14:39:18 2023
Received: from a59-138.smtp-out.us-west-2.amazonses.com (a59-138.smtp-out.us-west-2.amazonses.com [54.240.59.138])
    by mailserv12.mydomain.net (8.15.2/8.15.2/Debian-14~deb10u1) with ESMTP id 33BIdGDV003061
    for <[email protected]>; Tue, 11 Apr 2023 14:39:18 -0400
Authentication-Results: mailserv12.mydomain.net;
    dkim=pass (1024-bit key; unprotected) header.d=scorpioncontact.com [email protected] header.b="ME+v6RKl";
    dkim=pass (1024-bit key; unprotected) header.d=amazonses.com [email protected] header.b="ipmPqQyJ";
    dkim-atps=neutral
DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/simple;
    s=zyd7bhcyyv6pkbmskjzvey56uuwqxgpn; d=scorpioncontact.com;
    t=1681238373;
    h=MIME-Version:From:To:Date:Subject:Content-Type:Message-ID;
    bh=bL3BFSeLE3chpj5/RvpeTn3+6Rv+aL2Z+ABDaa7iqj4=;
    b=ME+v6RKlhmYjhcAtszGjmpPrxm+6YacRKVrMCEht7fhrDER7LJFV+QaWRTYLrge0
    fRGzSPMk+JRE5adZwup7Q/8KkC+sfgfS73k23g/I5aLV96N/OmzlQ9WrMTYW2D2WNRQ
    O/1e3Lp06sZkBrZjyiRYdgfrnApl7cMriOmRucOA=
DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/simple;
    s=hsbnp7p3ensaochzwyq5wwmceodymuwv; d=amazonses.com; t=1681238373;
    h=MIME-Version:From:To:Date:Subject:Content-Type:Message-ID:Feedback-ID;
    bh=bL3BFSeLE3chpj5/RvpeTn3+6Rv+aL2Z+ABDaa7iqj4=;
    b=ipmPqQyJ5S3cp8TU9NIY3zehs/C/K0yE1vzNxj1hpHgHjXNq9WxfSPQHTURZqmS8
    m641YaijPHHTy9s3zL0A95b/hvFbrU0f4I8WbluGokATkqBMJsheleoXce8q1EgWFbP
    vzkVhPw9LEbGsmxnxA3HnFWvs1+bkzTfL+bQ+nyI=
x-scorpion-express-id: 65b8c774-1516-42d6-8c91-834020b9bfdb
MIME-Version: 1.0
From: "Scorpion Elite Marketing Team" <[email protected]>
To: [email protected], [email protected], [email protected],
        [email protected]
Date: Tue, 11 Apr 2023 18:39:33 +0000
Subject: New Contact Form Submitted on theclient123.com
Content-Type: multipart/alternative;
 boundary=--boundary_90037_299c72a4-1788-46f2-844e-daf4efca6e0b
Message-ID: <01010187719db599-3ea881ca-830d-4456-8616-e6b9369fc482-000000@us-west-2.amazonses.com>
Feedback-ID: 1.us-west-2.eicjSNBV8JhWOJqg0ogtPl1jzTlcz4eUD2AseGUjcbE=:AmazonSES
X-SES-Outgoing: 2023.04.11-54.240.59.138


----boundary_90037_299c72a4-1788-46f2-844e-daf4efca6e0b
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: base64
....................

Web Form Notification - Mail.Out Logs

Apr 11 14:39:18 mailserv12 sm-mta[3061]: 33BIdGDV003061: from=<01010187719db599-3ea881ca-830d-4456-8616-e6b9369fc482-000000@us-west-2.amazonses.com>, size=47680, class=0, nrcpts=1, msgid=<01010187719db599-3ea881ca-830d-4456-8616-e6b9369fc482-000000@us-west-2.amazonses.com>, proto=ESMTP, daemon=MTA, relay=a59-138.smtp-out.us-west-2.amazonses.com [54.240.59.138]
Apr 11 14:39:18 mailserv12 opendkim[20328]: 33BIdGDV003061: a59-138.smtp-out.us-west-2.amazonses.com [54.240.59.138] not internal
Apr 11 14:39:18 mailserv12 opendkim[20328]: 33BIdGDV003061: not authenticated
Apr 11 14:39:18 mailserv12 opendkim[20328]: 33BIdGDV003061: message has signatures from scorpioncontact.com, amazonses.com
Apr 11 14:39:18 mailserv12 opendkim[20328]: 33BIdGDV003061: DKIM verification successful
Apr 11 14:39:18 mailserv12 opendkim[20328]: 33BIdGDV003061: s=zyd7bhcyyv6pkbmskjzvey56uuwqxgpn d=scorpioncontact.com SSL 
Apr 11 14:39:18 mailserv12 sm-mta[3061]: 33BIdGDV003061: Milter insert (1): header: Authentication-Results:  mailserv12.mydomain.net;\n\tdkim=pass (1024-bit key; unprotected) header.d=scorpioncontact.com [email protected] header.b="ME+v6RKl";\n\tdkim=pass (1024-bit key; unprotected) header.d=amazonses.com [email protected] header.b="ipmPqQyJ";\n\tdkim-atps=neutral
Apr 11 14:39:19 mailserv12 sm-mta[3128]: 33BIdGDV003061: to=|/home/project/theclient123.com/mail_receiver/symbolic_links/useraaa, ctladdr=<[email protected]> (8/0), delay=00:00:01, xdelay=00:00:01, mailer=prog, pri=78253, dsn=2.0.0, stat=Sent

My Own Test Notification - Header

From [email protected] Tue Apr 11 15:12:06 2023
Received: from mailserv16.mydomain.net (mailserv16 [108.174.96.236])
    by mailserv12.mydomain.net (8.15.2/8.15.2/Debian-14~deb10u1) with ESMTP id 33BJC4jO030103;
    Tue, 11 Apr 2023 15:12:06 -0400
Authentication-Results: mailserv12.mydomain.net;
    dkim=pass (1024-bit key; unprotected) header.d=thesecondclient.com [email protected] header.b="CRwy8b19";
    dkim-atps=neutral
Received: from mailserv16.mydomain.net (localhost [127.0.0.1])
    by mailserv16.mydomain.net (8.15.2/8.15.2/Debian-14~deb10u1) with ESMTP id 33BJBh6x031483;
    Tue, 11 Apr 2023 15:11:43 -0400
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=thesecondclient.com;
    s=default; t=1681240303;
    bh=TyxDFFT2b9//OI2sxrmvqxdMhjAi1WsVntJyetPgHDk=;
    h=Date:From:To:Subject;
    b=CRwy8b19myhGZ74YsypoFmPG3SXBppaTo5MYRu3YvYS4DrNzcXWMHiCZZc7Z9Safc
     qBEiG+3h+VxooKP/HYWtUQI172gldANyn4N/+XSWB6hWec0/n3ZnlHdkbGXsEGazCW
     AkbS4GGYXbIAlQ9m19273P+mljIfR6FwxuGiGwcE=
Received: (from susan@localhost)
    by mailserv16.mydomain.net (8.15.2/8.15.2/Submit) id 33BJBhus031481;
    Tue, 11 Apr 2023 15:11:43 -0400
Date: Tue, 11 Apr 2023 15:11:43 -0400
Message-Id: <[email protected]>
X-Authentication-Warning: mailserv16.mydomain.net: susan set sender to [email protected] using -f
From: [email protected]
To: [email protected], [email protected], [email protected],
        [email protected]
Subject: Test
x-mailer: Tester
Mime-Version: 1.0
Content-Type: multipart/mixed;
 boundary="-------------PineappleCode0"

---------------PineappleCode0
Content-Type: text/html; charset="UTF-8"

All the testing
---------------PineappleCode0--

My Own Test Notification - Mail.Out Logs

Apr 11 15:12:06 mailserv12 sm-mta[30103]: 33BJC4jO030103: from=<[email protected]>, size=1284, class=0, nrcpts=3, msgid=<[email protected]>, proto=ESMTP, daemon=MTA, relay=mailserv16 [108.174.96.236]
Apr 11 15:12:06 mailserv12 opendkim[20328]: 33BJC4jO030103: no signing table match for '[email protected]'
Apr 11 15:12:06 mailserv12 opendkim[20328]: 33BJC4jO030103: DKIM verification successful
Apr 11 15:12:06 mailserv12 opendkim[20328]: 33BJC4jO030103: s=default d=thesecondclient.com SSL 
Apr 11 15:12:06 mailserv12 sm-mta[30103]: 33BJC4jO030103: Milter insert (1): header: Authentication-Results:  mailserv12.mydomain.net;\n\tdkim=pass (1024-bit key; unprotected) header.d=thesecondclient.com [email protected] header.b="CRwy8b19";\n\tdkim-atps=neutral
Apr 11 15:12:07 mailserv12 sm-mta[30189]: 33BJC4jO030103: to=|/home/project/theclient123.com/mail_receiver/symbolic_links/userbbb, ctladdr=<[email protected]> (8/0), delay=00:00:01, xdelay=00:00:01, mailer=prog, pri=91664, dsn=2.0.0, stat=Sent
Apr 11 15:12:07 mailserv12 sm-mta[30189]: 33BJC4jO030103: to=|/home/project/theclient123.com/mail_receiver/symbolic_links/info, ctladdr=<[email protected]> (8/0), delay=00:00:01, xdelay=00:00:00, mailer=prog, pri=91664, dsn=2.0.0, stat=Sent
Apr 11 15:12:08 mailserv12 sm-mta[30189]: 33BJC4jO030103: to=|/home/project/theclient123.com/mail_receiver/symbolic_links/useraaa, ctladdr=<[email protected]> (8/0), delay=00:00:02, xdelay=00:00:01, mailer=prog, pri=91664, dsn=2.0.0, stat=Sent

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