I have retrieved the headers:

Return-Path: <barrywvarneyh952@gmail.com>
Received: from compute4.internal (compute4.nyi.internal [10.202.2.44])
by sloti44n40 (Cyrus 3.7.0-alpha0-935-ge4ccd4c47b-fm-20220914.001-ge4ccd4c4) with LMTPA;
Fri, 23 Sep 2022 09:14:21 -0400
X-Cyrus-Session-Id: sloti44n40-1663938861-1037676-2-16521453121443000607
X-Sieve: CMU Sieve 3.0
X-Spam-known-sender: no
X-Spam-sender-reputation: 500 (none)
X-Spam-score: 0.1
X-Spam-hits: DCC_REPUT_13_19 -0.1, FREEMAIL_ENVFROM_END_DIGIT 0.25, FREEMAIL_FROM 0.001,
HTML_MESSAGE 0.001, ME_SENDERREP_NEUTRAL 0.001,
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T_FREEMAIL_DOC_PDF 0.01, LANGUAGES unknown, BAYES_USED none,
SA_VERSION 3.4.6
X-Spam-source: IP='209.85.219.49', Host='mail-qv1-f49.google.com', Country='US',
FromHeader='com', MailFrom='com'
X-Spam-charsets: plain='UTF-8', html='UTF-8'
X-Attached: Details (3).pdf
X-Resolved-to: <throw10920 address>
X-Delivered-to: <throw10920 address>
X-Mail-from: barrywvarneyh952@gmail.com
Received: from mx5 ([10.202.2.204])
by compute4.internal (LMTPProxy); Fri, 23 Sep 2022 09:14:21 -0400
Received: from mx5.messagingengine.com (localhost [127.0.0.1])
by mailmx.nyi.internal (Postfix) with ESMTP id 634BF2720140
for <throw10920 address>; Fri, 23 Sep 2022 09:14:21 -0400 (EDT)
Received: from mx5.messagingengine.com (localhost [127.0.0.1])
by mx5.messagingengine.com (Authentication Milter) with ESMTP
id 56AEB231292;
Fri, 23 Sep 2022 09:14:21 -0400
ARC-Seal: i=1; a=rsa-sha256; cv=none; d=messagingengine.com; s=fm2; t=
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ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=
messagingengine.com; h=mime-version:from:date:message-id:subject
:to:content-type; s=fm2; t=1663938861; bh=mgoaWyWp1yTWBa0JtRKZ3J
G3oT/BJWrtmRX+y6Pw8Ig=; b=sNMnMvPQYLl9OhPIu+/FvA4GQcAIPIxBNTNyIE
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ARC-Authentication-Results: i=1; mx5.messagingengine.com;
x-csa=none;
x-me-sender=none;
x-ptr=pass smtp.helo=mail-qv1-f49.google.com
policy.ptr=mail-qv1-f49.google.com;
bimi=skipped (DMARC Policy is not at enforcement);
arc=none (no signatures found);
dkim=pass (2048-bit rsa key sha256) header.d=gmail.com
header.i=@gmail.com header.b=h/YxiNwR header.a=rsa-sha256
header.s=20210112 x-bits=2048;
dmarc=pass policy.published-domain-policy=none
policy.published-subdomain-policy=quarantine
policy.applied-disposition=none policy.evaluated-disposition=none
(p=none,sp=quarantine,d=none,d.eval=none) policy.policy-from=p
header.from=gmail.com;
iprev=pass smtp.remote-ip=209.85.219.49 (mail-qv1-f49.google.com);
spf=pass smtp.mailfrom=barrywvarneyh952@gmail.com
smtp.helo=mail-qv1-f49.google.com
X-ME-Authentication-Results: mx5.messagingengine.com;
x-aligned-from=pass (Address match);
x-google-dkim=pass (2048-bit rsa key) header.d=1e100.net
header.i=@1e100.net header.b=iv6O/RRb;
x-return-mx=pass header.domain=gmail.com policy.is_org=yes
(MX Records found: alt4.gmail-smtp-in.l.google.com,gmail-smtp-in.l.google.com,alt2.gmail-smtp-in.l.google.com,alt1.gmail-smtp-in.l.google.com,alt3.gmail-smtp-in.l.google.com);
x-return-mx=pass smtp.domain=gmail.com policy.is_org=yes
(MX Records found: alt2.gmail-smtp-in.l.google.com,alt1.gmail-smtp-in.l.google.com,alt3.gmail-smtp-in.l.google.com,alt4.gmail-smtp-in.l.google.com,gmail-smtp-in.l.google.com);
x-tls=pass smtp.version=TLSv1.3 smtp.cipher=TLS_AES_256_GCM_SHA384
smtp.bits=256/256;
x-vs=clean score=0 state=0
Authentication-Results: mx5.messagingengine.com;
x-csa=none;
x-me-sender=none;
x-ptr=pass smtp.helo=mail-qv1-f49.google.com
policy.ptr=mail-qv1-f49.google.com
Authentication-Results: mx5.messagingengine.com;
bimi=skipped (DMARC Policy is not at enforcement)
Authentication-Results: mx5.messagingengine.com;
arc=none (no signatures found)
Authentication-Results: mx5.messagingengine.com;
dkim=pass (2048-bit rsa key sha256) header.d=gmail.com
header.i=@gmail.com header.b=h/YxiNwR header.a=rsa-sha256
header.s=20210112 x-bits=2048;
dmarc=pass policy.published-domain-policy=none
policy.published-subdomain-policy=quarantine
policy.applied-disposition=none policy.evaluated-disposition=none
(p=none,sp=quarantine,d=none,d.eval=none) policy.policy-from=p
header.from=gmail.com;
iprev=pass smtp.remote-ip=209.85.219.49 (mail-qv1-f49.google.com);
spf=pass smtp.mailfrom=barrywvarneyh952@gmail.com
smtp.helo=mail-qv1-f49.google.com
X-ME-VSCause: gggruggvucftvghtrhhoucdtuddrgedvfedrfeefiedgieefucetufdoteggodetrfdotf
fvucfrrhhofhhilhgvmecuhfgrshhtofgrihhlpdggtfgfnhhsuhgsshgtrhhisggvpdfu
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hvrghrnhgvhihhleehvdesghhmrghilhdrtghomheq
X-ME-VSScore: 0
X-ME-VSCategory: clean
X-ME-CSA: none
Received-SPF: pass
(gmail.com ... _spf.google.com: Sender is authorized to use 'barrywvarneyh952@gmail.com' in 'mfrom' identity (mechanism 'include:_netblocks.google.com' matched))
receiver=mx5.messagingengine.com;
identity=mailfrom;
envelope-from="barrywvarneyh952@gmail.com";
helo=mail-qv1-f49.google.com;
client-ip=209.85.219.49
Fastmail-MaskedEmail: id=masked-REDACTED; state=enabled
Received: from mail-qv1-f49.google.com (mail-qv1-f49.google.com [209.85.219.49])
(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)
key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256)
(No client certificate requested)
by mx5.messagingengine.com (Postfix) with ESMTPS
for <throw10920 address>; Fri, 23 Sep 2022 09:14:21 -0400 (EDT)
Received: by mail-qv1-f49.google.com with SMTP id l1so563450qvu.11
for <throw10920 address>; Fri, 23 Sep 2022 06:14:21 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
d=gmail.com; s=20210112;
h=to:subject:message-id:date:from:mime-version:from:to:cc:subject
:date;
bh=mgoaWyWp1yTWBa0JtRKZ3JG3oT/BJWrtmRX+y6Pw8Ig=;
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X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
d=1e100.net; s=20210112;
h=to:subject:message-id:date:from:mime-version:x-gm-message-state
:from:to:cc:subject:date;
bh=mgoaWyWp1yTWBa0JtRKZ3JG3oT/BJWrtmRX+y6Pw8Ig=;
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Og3A==
X-Gm-Message-State: ACrzQf0w3TsrGRPOEfDzfdBI2/rmC0zGH0WSziUrRNf8THrMDa6ThD3J
W026gpn0qliT/A0JT6eA19P1+TbIkepxud+rpCg=
X-Google-Smtp-Source: AMsMyM4jCwL+QF3C+JZWnSqkWjbmCkW7hpRxCD40bhCGLWRp+46CIb2DL4OPAS0OePSQitgavYsgfYNlBUfx7RU31jQ=
X-Received: by 2002:a0c:f18d:0:b0:4ad:1149:3975 with SMTP id
m13-20020a0cf18d000000b004ad11493975mr7062648qvl.24.1663938859522; Fri, 23
Sep 2022 06:14:19 -0700 (PDT)
MIME-Version: 1.0
From: Barryw Varneyh <barrywvarneyh952@gmail.com>
Date: Fri, 23 Sep 2022 18:44:07 +0530
Message-ID: <CA+AZ9Gv3P8JtiMhte5LpG2=AnRJi-3BzFGGrpq+wxhqSVtuwHQ@mail.gmail.com>
Subject: invoice
To: <list of several hundred random domestic email addresses - aol, hotmail, yahoo, icloud, gmail, etc.>