HTML / Plaintext emails

[jcats]

We are having issues with ticket / welcome emails going to spam because:

-1.105   MIME_HTML_ONLY   Message only has text/html MIME parts
You should also include a text version of your message (text/plain)

Our emails include 3 images and a bunch of HTML, 44% text. 

Am I confused on how the email templates work, there is a "Plain Text" tab and a "HTML" tab.  Why does the text in the "Plain Text" tab automatically turn into HTML once you switch tabs and go back to it.

[jcats]

Can anyone else get plain text emails to work?  No matter what I do, they are always HTML, even if I can get the text box inside the Plain Text to be literally only text no html, there is still HTML added after the email is sent.......

Note: It takes ~60 - 90 minutes for cPanel install, during this time it's best you do not make any changes to your VPS.<br />
<br />
For support, billing, service management and account information, please visit:<br />
<br />
<br />

It includes HTML regardless... Makes no sense.
Content-Type: text/html; charset=utf-8

[DeLeTe Me]

Can anyone else get plain text emails to work?  No matter what I do, they are always HTML, even if I can get the text box inside the Plain Text to be literally only text no html, there is still HTML added after the email is sent.......

Note: It takes ~60 - 90 minutes for cPanel install, during this time it's best you do not make any changes to your VPS.<br />
<br />
For support, billing, service management and account information, please visit:<br />
<br />
<br />

It includes HTML regardless... Makes no sense.
Content-Type: text/html; charset=utf-8

Hi,

Sadly Hostbill is made so you either use plaintext, or HTML mails..

I advise you to use www.mail-tester.com See attached image for our mail-score with our Welcome config cpanel mail, the only downscore is that Hostbil never was coded to both send plain and HTML versions.