Adding a signature in outbound email account (personal) as per this article here: Compose Email 'From' Dropdown Behaviour :: SuiteCRM Documentation
Added just some simple text:
yields this result:
which is pretty messed up. The code automatically added by SuiteCRM:
<!DOCTYPE html>
<html>
<head>
</head>
<body>
Obviously it mess up the other code which is outside of the tags
and then it automatically add this code from the outbound account signature field.
</body>
</html><div class="email-signature-element"><p>this is a test</p></div>
It is not very strange that you end up with a blank email without a signature because the code is outside of the html closing tag.
I’m note sure how to fix this mess.
It obviously to me seem to be a bug. Right? 
Is there a way to disable that SuiteCRM adds this code string automatically, (the < htm l>< head ></ head >< body > part)?
Thanks in advance.