Re: quick (I hope) e-mail security question.

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On 20190713 16:29:20, home user via users wrote:
(Tony Nelson said)
 > [snip]
 >
 > Look at the message header. (View Source is a good way,
 > as it will be exact.) The first Received: line and any
 > lines before it come from your email provider, who is
 > mostly to be trusted, though anyone can make mistakes.
 > If that line says the "from" is reasonable,

I attached the full message with line numbers added to help discussion, and with private parts replaced with "[private]".  You are referring to line 31, not line 7, right?  I don't see anything there saying/implying the "from" is reasonable.

 > look at the lines up to and inclucing the next
 > Received: line and loop, otherwise stop, it's spam.

You're referring to line 33, right?
I don't understand what you mean by "line and loop".

The main thing troubling me is that the message claims to come from a gmail address, but it's sent from Yahoo Mail.  How is that possible?

thanks,
Bill.

spoofheader.txt

      1	X-Apparently-To: [private]; Sat, 13 Jul 2019 21:33:09 +0000
      2	Return-Path: <[private]>
      3	Authentication-Results: mta4406.mail.ne1.yahoo.com;
      4	 dkim=pass (ok) header.i=@gmail.com header.s=20161025;
      5	 spf=pass smtp.mailfrom=@gmail.com;
      6	 dmarc=pass(p=none sp=quarantine dis=none) header.from=gmail.com;
      7	Received-SPF: pass (domain of gmail.com designates 209.85.166.41 as permitted sender)
      8	X-YMailISG: UfTWcpUWLDt9VbLjmP9pJbf3OmIC53rwpG_C7TjDRgDymvPB
      9	 BTNlUcZakGXI0sxvNXFx9wzjJmKP2kAY0t9JoARolsPbRSV4A4fCsh65475m
     10	 jclL.itnwmgSrdNG.AkDZjtUeVEEZOj8kwtvd4Ucw3zfi2jZWVYyKQuFkNyp
     11	 5EUUs3eEy4yJ6K7_SH_I64Ekx.2TOTseBrw55XGKXVb0oe0xLZ3k9EBxOmat
     12	 lvkQYub6IhXGJQMSjnkD4d.8bLvW3JwtamQh_jrWegyZgakvGmV018guKJjW
     13	 IzZNgBYT2zX4B6bRmwya0FPkga9FYlAwSUJjL6n4BAbPqAqyqWg0EEI1Jngq
     14	 MuQCnef8RiF75VlahGYYDQuDDK0KHs2UQmvOx6QItfSIdO8.v0glMZGxK17b
     15	 loYVsNGjFiuEPiNmgDfp8flbjNBBW6n6M.FG3msDMMPJ8FKqyIqdcn.qhQ.q
     16	 EynO_PhlDlSsYlTq5_YftYVABxPnhAhdgKZc8ve.YvvTLuQOQUF_YSyCdkNT
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     20	 lnO_UDzlDDhYWsMSzgAdFsvsQQM6VO61lN_WboZJFaVDj0YezwC_iQxrk.om
     21	 2gfQqXo.bDBUs9wyYbmqz2yJJfqsbW8gJReDClOrkZJbUFNa7MJwfV0bKXNW
     22	 A9BuWK3VaQKbBqxJDtj1xGhn9lNY5PpyBCQkFG1WVYN_SbJY2uGP50m2.tP3
     23	 VDwNXvUqwN6A.EToTeuTEUq_pMMq4W9O5ZxXH9oCiQORHHi5gDjFOd32bQLk
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     25	 zQ3JnWkop3i2RofghLWhBV6sEw1kDrIuE7bw70IXwRWibvTRwePFk_KtGlmZ
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     28	 DzQCnwS3S4Un.NZBfdhUPTmVltz.0qKQyvSu4X3CK4Mauw3Cdr0BIM2ELxXb
     29	 Uq.a700ZtETRgLZiYHkZYDE-
     30	X-Originating-IP: [209.85.166.41]
     31	Received: from 127.0.0.1  (EHLO mail-io1-f41.google.com) (209.85.166.41)
     32	  by mta4406.mail.ne1.yahoo.com with SMTPS; Sat, 13 Jul 2019 21:33:09 +0000
     33	Received: by mail-io1-f41.google.com with SMTP id k8so27923627iot.1;
     34	        Sat, 13 Jul 2019 14:33:09 -0700 (PDT)
     35	DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
     36	        d=gmail.com; s=20161025;
     37	        h=date:from:reply-to:to:message-id:subject:mime-version:references;
     38	        bh=MgkjHii2ksvTjACY0qnqI3YCoTu9q9HsYjhT+2mleGw=;
     39	        b=QTBD19oaeu7t5qGDN2Tm/JEIccMRvh9+kwxLbhjDNh0auWHq58VPxTlRBVVuKWtpDD
     40	         g0eGmTLB74eCSkKj3UooCw46WfD0lEIFgt0Bg0WR7fIqqOtCgKqjDllKZVsslHM4MGxK
     41	         kq+aCIEsUVS2MDIoBqYmuwa+NaGpcl0j+VRqOgF0Ftmq8X5ya8yI+Fj33jugeMdMwyfT
     42	         97hiZunVJ/UDHNgJOgf0WFrApWVBiJnP2kudJGrTKlL2ooV58OxlLtaRw27wBJbrR5Lg
     43	         xqtlZb14gbk1MK/0gkRP9SfXCr2sWgg6nZWXa0k1G7MQpv8EzLeLudHleYxzK45Z2git
     44	         OiqQ==
     45	X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
     46	        d=1e100.net; s=20161025;
     47	        h=x-gm-message-state:date:from:reply-to:to:message-id:subject
     48	         :mime-version:references;
     49	        bh=MgkjHii2ksvTjACY0qnqI3YCoTu9q9HsYjhT+2mleGw=;
     50	        b=PsYXrRGycP3WDRvhunmjg0E1vCMI83JKy7XzgDGRuUKZVIL/IrYzjnans9AEamkhyL
     51	         5foQFF1xnmPe2ES31P1VFGDWnZUjlT9L+yGkxZsN8erHPHkOnASWtjPDbl5U3qzNve/s
     52	         3+91vMQKDZWFRNLPoqFHxyJEicmxHHSkLV+qiyVfzhNHUjQnkzaP8MQ1pXMR+ct3oEcF
     53	         23i+esUsdIAqC7AAJKQvQ4uM2MrVDCQxnlkmhqNaGWiKXHuv0CCLBs2ZXYKr6JpD4UeJ
     54	         FeFTmWhSpqorjpOo4v2KboO29ZU7BbrzxvPZwHH7oc+lX1MNth2ORa9JQHLlMVJPjdem
     55	         DoEw==
     56	X-Gm-Message-State: APjAAAUieN/NT/7bCGWoOCM7p0nun2dENZf7WZrsTjn7e7JiNSaAQQ46
     57		X+4+o9+krEqnlaDFkXSNKTHbhkfD
     58	X-Google-Smtp-Source: APXvYqxNOZUf94JAPxPHigDL21gIoXISKHQ4MHaZ+KA1x45IsuDXHevxMaE5RfBSUn/DcRe8IdhLiw==
     59	X-Received: by 2002:a5d:9b1a:: with SMTP id y26mr17672471ion.238.1563053588544;
     60	        Sat, 13 Jul 2019 14:33:08 -0700 (PDT)
     61	Return-Path: <[private]>
     62	Received: from sonic316-12.consmr.mail.bf2.yahoo.com (sonic316-12.consmr.mail.bf2.yahoo.com. [74.6.130.122])
     63	        by smtp.gmail.com with ESMTPSA id z26sm13199729ioi.85.2019.07.13.14.33.07
     64	        (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128);
     65	        Sat, 13 Jul 2019 14:33:07 -0700 (PDT)
     66	X-YMail-OSG: 05TfIBwVM1nOm3krOdXc5g5lmLSqCqfZZ2ce7zPSafn7Sr63s53U.016lN9lA37
     67	 uRhpAvb.Mv5uv3IvADfErNmdBK_rICbXAcLzYiDvHWk8GE0WSaZ5Y4zURu9ZM0JM8uR2FmyZhn1u
     68	 bYN.b1gmvrZRlylvv6T7va1udVVznhpTj1QUseVarX47asTYiX_SLnQ9tt0NvO92UA9CiL0CpV2K
     69	 VqGFs.ANovj4Qd68cr4AAUESN8UzfFE.gXVM9DR2gPVUF5JCV6r67sD5HErYC0ZmXNK_ae59sb0g
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     71	 LBiY71qiINS7Ha_jwqMSIlypGlJzezRFK2L7P9bA_4IdRYhI6hCGSbiUAA7alRg88cCTdpU1CJYE
     72	 5U0Gf5yGqnvgvSz5XNfnJ0y4QnVhDhpHHbTYt1Tc3lOpTm9rz98DmO_O7mMMHgKhwt9mwsxBUh_Z
     73	 iVgGQxK1uCooUbZV103jyWcYouw_3BUWgf2pfSJi_6nzqRMzeg8wjbpdSNmo2ozDD3Y5TqgpO8sv
     74	 V._6Y31EjYJZcUGq232rTran70ZMFiMoNJqmIu9tBZRqnI_65zK1dpPIgmr2b1ryK0hCkOHtE1cg
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     79	 Imtufmlv7gIMY.CDv.z_ztslxxR.7gLFRmjyFISxPa0t9iF56ayKdLR5bBWctnb3FEx6ntp6338j
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     81	 B4JGWNg_kAd69u3Tz04JjOPukjvRnJopT19IC.p.ES8np6vyxD4kVAW3WOMzzVFYL9TRVERWhoE2
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     83	 Po8OFW75q1pd2xSfRcx_efQB6.7riPOE3rZHya8lLt_j33x1y8s9nNh6H
     84	Received: from sonic.gate.mail.ne1.yahoo.com by sonic316.consmr.mail.bf2.yahoo.com with HTTP; Sat, 13 Jul 2019 21:33:07 +0000
     85	Date: Sat, 13 Jul 2019 21:33:02 +0000 (UTC)
     86	From: "[private]" <[private]>
     87	Reply-To: "[private]" <[private]>
     88	To: [private] <[private]>, [private] <[private]>
     89	Message-ID: <1006046679.433253.1563053582396@xxxxxxxxxxxxxx>
     90	Subject: [private]
     91	MIME-Version: 1.0
     92	Content-Type: multipart/alternative;
     93		boundary="----=_Part_433252_1220207963.1563053582396"
     94	References: <1006046679.433253.1563053582396.ref@xxxxxxxxxxxxxx>
     95	X-Mailer: WebService/1.1.13991 YahooMailAndroidMobile YMobile/1.0 (com.yahoo.mobile.client.android.mail/5.40.2; Android/8.0.0; R16NW; j7topltetmo; samsung; SM-J737T; 5.46; 1280x720;)
     96	Content-Length: 948
     97	
     98	------=_Part_433252_1220207963.1563053582396
     99	Content-Type: text/plain; charset=UTF-8
    100	Content-Transfer-Encoding: quoted-printable
    101	
    102	[private]
    103	[private]
    104	
    105	Sent from Yahoo Mail on Android
    106	------=_Part_433252_1220207963.1563053582396
    107	Content-Type: text/html; charset=UTF-8
    108	Content-Transfer-Encoding: 7bit
    109	
    110	[private]<br><br><div id="ymail_android_signature"><a id="ymail_android_signature_link" href="https://go.onelink.me/107872968?pid=InProduct&amp;c=Global_Internal_YGrowth_AndroidEmailSig__AndroidUsers&amp;af_wl=ym&amp;af_sub1=Internal&amp;af_sub2=Global_YGrowth&amp;af_sub3=EmailSignature";>Sent from Yahoo Mail on Android</a></div>
    111	------=_Part_433252_1220207963.1563053582396--

At a quick glance the email itself probably flowed from a yahoo sender to your gmail account. This portion of the bottom of the message bothers me:
href="https://go.onelink.me....

You erased one of the more important clues for legitimacy. Do the "Reply-To:" and "From:" headers make sense when considered together?

I note that "anyone" (or any sufficiently clever robot) can create a yahoo account and send at least a few emails. So if the email was unexpected and/or from somebody you do not know it is right to question it. Does the "From:" make sense considering the contents. There is no way I can tell. You even blanked the subject. If it was a "your bank account has been compromised" email sent through Yahoo, why are you asking here about legitimacy of such a monstrosity? And if there is ANY question about the email and it is asking you to forward money "to your boss vacationing in Mexico" faghedaboudit. Use some thinking. And if you must worry about this send email back, gritting your teeth over the spamload this will unleash to a known "good" address, and ask for some information only you and your boss know. Establish identity beyond question before sacrificing money.

It's not paranoia when "they" really are out to get you but it's not personal, they will take any sucker they can get. It's prudence that says email is not to be trusted beyond the value you stand to lose by trusting it.

{^_^}   Joanne
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