Mass Contact HTML problem

Using Drupal 6, and the most recent modules of Mass Contact, Mime Mail and Mime CSS container enabled.

I am trying to send Mass Contact emails, but they come through without html. I am using Mime Mail (which works fine for mail sent from the site). Mass contact (using html option) looks somewhat like this.

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This is a multi-part message in MIME format. --04b44369af6a4068581e4b35e4811105 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Tested --04b44369af6a4068581e4b35e4811105 Content-Type: text/html; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit

Tested

Any ideas what is going on?