[Mailman-Users] AOL recipients getting scrambled html messages

[Terry]

I have a few members in a list that have addresses at AOL.com and lately 
they are reporting that the messages they receive via my distribution 
list are garbled. What's really happening is that aol is displaying raw 
html code to them instead of the message. Below is a short excerpt of 
the start of the messge they receive. There's a strange 
class="aolReplacedBody" in the first few lines that implies that aol is 
really messing with the html.

Any ideas what's happening and how to fix it?
Terry

/SAMPLE OF CORRUPTED EMAIL:
/ /To: members at mydomain.com
Sent: 11/15/2017 4:36:01 PM Pacific Standard Time
Subject: [CSR] Amazingly Awesome Memorial

<div id="AOLMsgPart_1.2_4219e60e-c0fd-404c-85fc-bed2fc88db83">
<div style="word-wrap: break-word; -webkit-nbsp-mode: space; 
-webkit-line-break: after-white-space;" 
class="aolReplacedBody"><div><blockquote class=""><div dir="ltr" 
class=""><div class="gmail_quote"><div style="background-color: rgb(255, 
255, 255); font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida 
Grande', sans-serif;" class=""><div 
class="m_4319761772406486274yahoo_quoted" 
id="m_4319761772406486274yui_3_16_0_ym19_1_1510520612793_65525" 
style="display: block;"><div style="font-family: 'Helvetica Neue', 
Helvetica, Arial, 'Lucida Grande', sans-serif;" 
id="m_4319761772406486274yui_3_16_0_ym19_1_1510520612793_65524" 
class=""><div style="font-family: HelveticaNeue, 'Helvetica Neue', 
Helvetica, Arial, 'Lucida Grande', sans-serif;" 
id="m_4319761772406486274yui_3_16_0_ym19_1_1510520612793_65523" 
class=""><div........./