How do I stop Evolution from adding HTML attachment to anything saved in Drafts folder?

[Rick]

I want to be able to start an email that I can continue working on later.
However, if I save it in the Drafts folder, Evolution automatically
attaches an HTML version of it.  To make matters worse, there doesn't
seem to be any way to remove the attachment.

Is there a way to remove an attachment or prevent Evolution from
automatically adding one?

Thanks!

Rick