I welcome your usage of HTML for bulk email. I wish all bulk email would use HTML. Since I junk all HTML email I get automatically, I wouldn't see any spam. ;-).

False positives you say? Well, there was one guy who used to send HTML email I did want to keep. It was just a matter of whitelisting him - but since then, he has been enlightned (clue by fours are such useful devices) and doesn't sent HTML email anymore anyway.

I guess many people call be old-fashioned, but for me, mail is plain text ASCII, and nothing else.