One suggestion is to use a well-known service for the distribution. We've had success with Aweber so far. Quality services have opt-in procedures and are less likely to have the HTML blocked.

When we send it our selves, many of the receiptients never received it.

I also put the HTML version on our web-server and the put a link to at the top of the message. That way, if it does come through jumbled up there is a quick for them to get to the formatted version.

__________________
CD Rates | CD Rates Blog | Banking Online