Appian adding additional HTML tags to email template

Certified Senior Developer

I'm having an issue where a client is receiving incomplete emails. 

They suspect the culprit has something to do with the source code of the email is including two (2) open and closing HTML tags.

The emails are being sent to an external system as well.

Here's the HTML the client is receiving (note that i've removed any details about the client in the email)

<html><body><html>
<body lang="EN-AU" link="blue" vlink="#A2C617" style='font-family:Calibri'/>
<p><div><font face="Calibri" size="3" color="#4B4B4B"/>
<b></b>
<br/>
<b>Appointment Type: </b> 
<b>Name: </b> 
<b>Position Title: </b> 
<b>Commencement Date: </b> 
<b>C-Level: </b> 
<b>Classification: </b> 
<b>Supervisor Name: </b> 
<b>Supervisor Contact: </b> 
<b>Appian Reference: </b> 2225561
<a href=""/>Click Here for Further Details</a>
<br/>
</div></p></html></body></html>

On the top and bottom lines there are two HTML open and close tags,

I've checked the template I'm using to format these emails and the source looks like this

<HTML>
<head>
<meta http-equiv=Content-Type content="text/html; charset=windows-1252">
<meta name=Generator content="Microsoft Word 14 (filtered)">
<title>Email Template</title>
</head>
<body lang=EN-AU link=blue vlink="#A2C617" style='font-family:Calibri'>
<p><PRE><font face="Calibri" size="3" color="#4B4B4B">
<b></b>
<br>
<b>Appointment Type: </b> ###appointmentType###
<b>Name: </b> ###name###
<b>Position Title: </b> ###positionTitle###
<b>Commencement Date: </b> ###startDate###
<b>C-Level: </b> ###clevel###
<b>Classification: </b> ###classification###
<b>Supervisor Name: </b> ###supName###
<b>Supervisor Contact: </b> ###supEmail###
<b>Appian Reference: </b> ###reference###
<a href="###link###">Click Here for Further Details</a>
<br>
</HTML>

Where there's only a single open and close tag, as it should be

What could be a possible reason causing this?

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