I'm trying to send a plain text newsletter using the newsletter module. No matter what I do, even if I make all the send() functions in the newsletter module's code into sendPlain(), it still send out email with a mime part, like this:
This is a multi-part message in MIME format.
Content-Type: text/plain; charset="utf-8"
<p>This is a draft newsletter.</p>
How can I make it so, that it sends out some old-fashioned text email? Thanks!