> IMO, they could do the same with a HTML document in a password-protected > ZIP file. So I'm -1 about this idea.
There's a significant gap between ZIP files (especially password-protected ones) and forwarded messages. The latter looks much more innocent, is well-supported everywhere, and is even displayed inline (either by default or through an option) in some MUAs like Apple Mail and Mozilla. Bear in mind we've always been rendering text/message parts up through 2.64, just not especially gracefully. Ignoring them would create a gaping wide hole. Daniel -- Daniel Quinlan anti-spam (SpamAssassin), Linux, http://www.pathname.com/~quinlan/ and open source consulting
