Here's some more problems:
1) Sending text like this: " [ No Parargraph ] style " causes the "No Paragraph" to become a false link
2) I'm getting a lot of "& nbsp:" at the beginning of lines of code when I enclose code in [ code ][ /code ] blocks (copied and pasted from BBEdit).
Does BBEdit have a "convert tabs to spaces" feature? I remember seeing similar things (posted via the Web forums) in code-testing threads during the Preview phase. Or maybe pasting to a different editor, then from that editor to your email client? Extra steps, but worth trying?
BBEdit does have a convert tabs to spaces command, Detab. Entab converts spaces to tabs.