Email Received on Yahoo shows HTML code, not a proper message

Email sent to a Yahoo user are received showing HTML formatting.
Is there a way to determine the cause?

Possible clues:
a CC: to an AOL user
An attachment

Here is a sample of what the message looks like, followed by the raw message:  
(Thanks)


<br>
<blockquote type="cite">
On October 19, 2018 at 12:13 PM Office Person <mxxxxxxxxxx@yahoo.com mailto:mxxxxxxxxxx@yahoo.com > wrote:
<br>
<br>
<div class="">
Dear Debbie,
</div>
<div class="">
<br class="">
</div>
<div class="">
Please find attached the initial Listing of Subject Matters, signed by Mxxxxx.
</div>
<


Raw Message below:

X-Apparently-To: mxxxxxxxxxx@yahoo.com; Fri, 19 Oct 2018 16:17:12 +0000
Return-Path: <info@dxxxxxxxxxxxxxxxxxn.com>
Received-SPF: none (domain of dxxxxxxxxxxxxxxxxxn.com does not designate permitted sender hosts)
X-YMailISG: qKG.UH8WLDs.FOsB1cMyFkzusazDRBj4HKCjOMdAX4qI0S7C
 DY8g.6LrdFltqjnqbSIHK5DJieJAm1MMp4hByEqI7mBZLFjod0BpERqUekPO
 ZQCQOXBiqa07zP1R7yD.9pKqIGINzHvaUzbqikOagkO9.ENL2_B7uoySjxfc
 6ZEzdk7GQcML.Jc3_fzUXBl6Ah5PcqzR1F81UYr11Uu0RxzhnLv0QDwD1EA_
 JvvYw.KkxMXDSg_KAtVrP1ytrC.sFF7.u3rLBO8XFZ8eR6761rNDZSBJzmx.
 6jxv3GfES7dd0Riz3RrSyLTO9hWGzrjtZuiH6Rv7qmG9NXtMcTaVSar2CJrU
 YJUZp2JBn491_DKLdvUW5_qEAxmGjxeB75sf_Xmn3_IRbfpf19Yjb_AOnkDE
 LLnDwwFNQxQikfDUGQ6GYG_fN5BZbUnbrFumz9YrO1chVPJfMfPXw_EdD7Tb
 xDXP3xrYcU3xkSdVIs3wQXZOn8tV.rwBt7QuxTfs95p.3CMz213Sa.lNmDhv
 9QkbZFU860Z6W8le7FfH1A7a5voXBk0qb_p4m33pibtAyX3VhIFuBWr3bsFW
 lZ8Mq_fmtyejORaU.p2amR0Cy4PGD9Htbpla723topvoTvVPh_xTdwEaT_WO
 AkXU.0Q1TaFZ8vUXSsxJdoNBL5Cj.gBddGvzPatmfBKVR1saaE8P_Jq3TsGU
 3oSFShBNGmLPGpYQ0f3Ciix7PeZeC7KZlfVt80P2IexF4HQXvqnzVvFJccRH
 M6mB3A_G_XYUcGFuUuNbiVzKcF8u99Jo3OwUORfCq21k96J3v.BGtF8VAvEw
 q9kOlMyT7fq_GDflFyxLHHkPyaNA8sqzoP_GAjJQs_mkXddi9Ug2OPGaqZLy
 PGx3tCJ8YZSo_PBcWxorP.RvNUkUXOKT8bXSqODNenRTgtn_ycYbME7KPbui
 IcLAtuX7lhBeXlgq6ZeozptCwKpdlMAROnzFOwqfnoVrfDA37kqmSDvtg8t8
 HHPB1D8VRUxMNpqKNiQbv6J1BdGP106GWlxzjAOnUTFI4LYWCJ2JWcncImcC
 c7l3W8JW
X-Originating-IP: [209.17.115.44]
Authentication-Results: mta4077.mail.gq1.yahoo.com  from=dxxxxxxxxxxxxxxxxxn.com; domainkeys=neutral (no sig);  from=dxxxxxxxxxxxxxxxxxn.com; dkim=neutral (no sig)
Received: from 127.0.0.1  (EHLO atl4mhob06.registeredsite.com) (209.17.115.44)
  by mta4077.mail.gq1.yahoo.com with SMTP; Fri, 19 Oct 2018 16:17:11 +0000
Received: from null ([10.30.71.93])
      by atl4mhob06.registeredsite.com (8.14.4/8.14.4) with ESMTP id w9JGH8QC020045
      (version=TLSv1/SSLv3 cipher=AES256-SHA256 bits=256 verify=NO);
      Fri, 19 Oct 2018 12:17:08 -0400
Date: Fri, 19 Oct 2018 12:17:08 -0400 (EDT)
From: "info dxxxxxxxxxxxxxxxxxn.com" <info@dxxxxxxxxxxxxxxxxxn.com>
Reply-To: "info dxxxxxxxxxxxxxxxxxn.com" <info@dxxxxxxxxxxxxxxxxxn.com>
To: Office Person <mxxxxxxxxxx@yahoo.com>
Cc: "Mr. & Mrs. Person Sending" <pxxxxxxxxxt@aol.com>
Message-ID: <421942086.137463.1539965828334@webmail6.networksolutionsemail.com>
In-Reply-To: <3B0893C1-66D3-47DB-B81B-9FB53D28ED2D@yahoo.com>
References: <D5AFD246-C829-4676-8681-EBCD58A6D960@aol.com>
 <434772167.41131.1539276371402@webmail6.networksolutionsemail.com>
 <3B0893C1-66D3-47DB-B81B-9FB53D28ED2D@yahoo.com>
Subject: Re: Subject Matter
MIME-Version: 1.0
Content-Type: multipart/alternative;
      boundary="----=_Part_137462_1317187521.1539965828328"
X-Priority: 3
Importance: Medium
X-Mailer: Open-Xchange Mailer v7.8.4-Rev41
X-Originating-Client: open-xchange-appsuite
Content-Length: 7182

------=_Part_137462_1317187521.1539965828328
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 7bit

Thanks!



<br>
<blockquote type="cite">
On October 19, 2018 at 12:13 PM Office Person <mxxxxxxxxxx@yahoo.com mailto:mxxxxxxxxxx@yahoo.com > wrote:
<br>
<br>
<div class="">
Dear Debbie,
</div>
<div class="">
<br class="">
</div>
<div class="">
Please find attached the initial Listing of Subject Matters, signed by Mxxxxx.
</div>
<div class="">
I will be in touch soon about additional Listings as the project develops.
</div>
<div class="">
<br class="">
</div>
<div class="">
Best and kind regards,
</div>
<div class="">
Amy Saxxxxy
</div>
<div class="">
<br class="">
</div>
<div class="">
<br class="">
</div>
<div class=""></div>
</blockquote>
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<blockquote type="cite">

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<blockquote type="cite" class="">
<div class="">
On Oct 11, 2018, at 12:46 PM, info
<a href="http://dxxxxxxxxxxxxxxxxxn.com" http://dxxxxxxxxxxxxxxxxxn.com class="">dxxxxxxxxxxxxxxxxxn.com</a> <
<a href="mailto:info@dxxxxxxxxxxxxxxxxxn.com mailto:info@dxxxxxxxxxxxxxxxxxn.com " class=""info@dxxxxxxxxxxxxxxxxxn.com">>info@dxxxxxxxxxxxxxxxxxn.com</a>> wrote:
</div>
<br class="Apple-interchange-newline">
<div class="">

<div class="">
<p class="">Good Afternoon,</p>
<p class="">Please complete the attached Listing of Subject Matter form and return it to our office. </p>
<p class="">This form enables us to xxxxxxxxxxxxxxxxx on Subject Matter work completed xxxxxxxxxxxxxxxx.</p>
<p class="">Thank you!</p>
<p class="">Debbie</p>
</div>
<span id="cid:AF7F2882-6F13-4B0D-ADDC-2710991AE68E@nyc.rr.com mailto:AF7F2882-6F13-4B0D-ADDC-2710991AE68E@nyc.rr.com "><Wxxxxxx Subject Mattermenet.pdf></span>
</div>
</blockquote>
</div>
<br class="">
</blockquote>
<br>


------=_Part_137462_1317187521.1539965828328
MIME-Version: 1.0
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: quoted-printable

<!DOCTYPE html>
<html><head>
    <meta charset=3D"UTF-8">
</head><body>Thanks!<br><br> <br> <br>  &#60;br&#62;<br>  &#60;blockquote t=
ype=3D&#34;cite&#34;&#62; <br>   On October 19, 2018 at 12:13 PM Office Ass=
istant &#60;<a href=3D"mailto:mxxxxxxxxxx@yahoo.com">mxxxxxxxxxx@yahoo.com<=
/a>&#62; wrote:<br>   &#60;br&#62;<br>   &#60;br&#62;<br>   &#60;div class=
=3D&#34;&#34;&#62;<br>    Dear Debbie,<br>   &#60;/div&#62;<br>   &#60;div =
class=3D&#34;&#34;&#62;<br>    &#60;br class=3D&#34;&#34;&#62;<br>   &#60;/=
div&#62;<br>   &#60;div class=3D&#34;&#34;&#62;<br>    Please find attached=
 the initial Listing of Subject Matters, signed by Mxxxxx.<br>   &=
#60;/div&#62;<br>   &#60;div class=3D&#34;&#34;&#62;<br>    I will be in to=
uch soon about additional Listings as the project develops.<br>   &#60;=
/div&#62;<br>   &#60;div class=3D&#34;&#34;&#62;<br>    &#60;br class=3D&#3=
4;&#34;&#62;<br>   &#60;/div&#62;<br>   &#60;div class=3D&#34;&#34;&#62;<br=
>    Best and kind regards,<br>   &#60;/div&#62;<br>   &#60;div class=3D&#3=
4;&#34;&#62;<br>    Amy Saxxxxy<br>   &#60;/div&#62;<br>   &#60;div class=
=3D&#34;&#34;&#62;<br>    &#60;br class=3D&#34;&#34;&#62;<br>   &#60;/div&#=
62;<br>   &#60;div class=3D&#34;&#34;&#62;<br>    &#60;br class=3D&#34;&#34=
;&#62;<br>   &#60;/div&#62;<br>   &#60;div class=3D&#34;&#34;&#62;&#60;/div=
&#62;<br>  &#60;/blockquote&#62; <br>  &#60;br&#62;&#160;<br>  &#60;blockqu=
ote type=3D&#34;cite&#34;&#62; <br>   <br>   &#60;div class=3D&#34;&#34;&#6=
2;&#60;/div&#62;<br>   &#60;div class=3D&#34;&#34;&#62;<br>    &#60;br clas=
s=3D&#34;&#34;&#62;<br>   &#60;/div&#62;<br>   &#60;div class=3D&#34;&#34;&=
#62;<br>    &#60;br class=3D&#34;&#34;&#62;<br>   &#60;/div&#62;<br>   &#60=
;div class=3D&#34;&#34;&#62;<br>    &#60;br class=3D&#34;&#34;&#62;<br>   &=
#60;/div&#62;<br>   &#60;div class=3D&#34;&#34;&#62;<br>    &#60;br class=
=3D&#34;&#34;&#62;<br>   &#60;/div&#62;<br>   &#60;div class=3D&#34;&#34;&#=
62;<br>    &#60;br class=3D&#34;&#34;&#62;<br>   &#60;/div&#62;<br>   &#60;=
div class=3D&#34;&#34;&#62;<br>    &#60;br class=3D&#34;&#34;&#62;<br>   &#=
60;/div&#62;<br>   &#60;div class=3D&#34;&#34;&#62;<br>    &#60;br class=3D=
&#34;&#34;&#62;<br>   &#60;/div&#62;<br>   &#60;div class=3D&#34;&#34;&#62;=
<br>    &#60;br class=3D&#34;&#34;&#62;<br>   &#60;/div&#62;<br>   &#60;div=
 class=3D&#34;&#34;&#62;<br>    &#60;br class=3D&#34;&#34;&#62;<br>   &#60;=
/div&#62;<br>   &#60;div class=3D&#34;&#34;&#62;<br>    &#60;br class=3D&#3=
4;&#34;&#62;<br>   &#60;/div&#62;<br>   &#60;div class=3D&#34;&#34;&#62;<br=
>    &#60;br class=3D&#34;&#34;&#62;<br>   &#60;/div&#62;<br>   &#60;div cl=
ass=3D&#34;&#34;&#62;<br>    &#60;br class=3D&#34;&#34;&#62;<br>   &#60;/di=
v&#62;<br>   &#60;br class=3D&#34;&#34;&#62;<br>   &#60;div&#62;<br>    &#6=
0;br class=3D&#34;&#34;&#62;<br>    &#60;blockquote type=3D&#34;cite&#34; c=
lass=3D&#34;&#34;&#62;<br>     &#60;div class=3D&#34;&#34;&#62;<br>      On=
 Oct 11, 2018, at 12:46 PM, info <br>      &#60;a href=3D&#34;<a href=3D"ht=
tp://dxxxxxxxxxxxxxxxxxn.com" rel=3D"noopener" target=3D"_blank">http://duc=
illoconstruction.com&#34;</a> class=3D&#34;&#34;&#62;dxxxxxxxxxxxxxxxxxn.co=
m&#60;/a&#62; &#60;<br>      &#60;a href=3D&#34;mailto:<a href=3D"mailto:in=
fo@dxxxxxxxxxxxxxxxxxn.com">info@dxxxxxxxxxxxxxxxxxn.com</a>&#34; class=3D&=
#34;&#34;<a href=3D"mailto:">info@dxxxxxxxxxxxxxxxxxn.com&#34;&#62;&#62;inf=
o@dxxxxxxxxxxxxxxxxxn.com</a>&#60;/a&#62;&#62; wrote:<br>     &#60;/div&#62=
;<br>     &#60;br class=3D&#34;Apple-interchange-newline&#34;&#62;<br>     =
&#60;div class=3D&#34;&#34;&#62; <br>       <br>      &#60;div class=3D&#34=
;&#34;&#62;<br>       &#60;p class=3D&#34;&#34;&#62;Good Afternoon,&#60;/p&=
#62;<br>       &#60;p class=3D&#34;&#34;&#62;Please complete the attached C=
ertificate of Subject Matter form and return it to our office.&#160;&#=
60;/p&#62;<br>       &#60;p class=3D&#34;&#34;&#62;This form enables us to =
reduce your costs by not charging sales tax on Subject Matter work com=
pleted on your property.&#60;/p&#62;<br>       &#60;p class=3D&#34;&#34;&#6=
2;Thank you!&#60;/p&#62;<br>       &#60;p class=3D&#34;&#34;&#62;Debbie&#60=
;/p&#62;<br>      &#60;/div&#62; <br>      &#60;span id=3D&#34;cid:<a href=
=3D"mailto:AF7F2882-6F13-4B0D-ADDC-2710991AE68E@nyc.rr.com">AF7F2882-6F13-4=
B0D-ADDC-2710991AE68E@nyc.rr.com</a>&#34;&#62;&#60;Wxxxxxx Subject Matterm=
enet.pdf&#62;&#60;/span&#62;<br>     &#60;/div&#62;<br>    &#60;/blockquote=
&#62;<br>   &#60;/div&#62;<br>   &#60;br class=3D&#34;&#34;&#62;<br>  &#60;=
/blockquote&#62; <br>  &#60;br&#62;&#160;<br> <br></body></html>
=20
------=_Part_137462_1317187521.1539965828328--
computerlarryAsked:
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Marcus BointonCommented:
Two wrong things in there.

Your multipart sub-elements should not have the `MIME-Version: 1.0` headers; only the root element needs that.

Your HTML body has a random mix of entity escaping and raw HTML. Nearly all of those entities should not be entities. For example where you have `&#60;br&#62;<br>` it should just be `<br><br>`. In short, you need to look at how you are constructing your message body.

I'd recommend using a library such as PHPMailer that can do all this encoding correctly for you; you shouldn't be doing it yourself.
computerlarryAuthor Commented:
Marcus - do you have an idea if the sender's email is creating a message with incorrect HTML or if Yahoo is mis-reading the message?  Could this just have been caused by some odd error on the sender?
Marcus BointonCommented:
This can only be down to the sender using confused (to use a generous term!) HTML.
David FavorLinux/LXD/WordPress/Hosting SavantCommented:
As Marcus suggested, the sender's email system, or how ever the message was constructed which might well be some ad-hoc/handrolled system... has produced a garbled message.

It's unlikely the above message will be readable in any email client.

Worse, Yahoo will likely mis-classify this as spam + downgrade the sender addr + IP reputation, if very many messages like this are sent to many Oath (Yahoo/AOL) recipients.

If you are in charge of the source of this email, best fix this before sending any more email to Oath recipients.

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