Apparently it works, kind of. Drupal's mailhandler module does a nice job inserting the full email message into the drupal database, and displaying it inline. It even let the basic markup in place.
It's when you start editing the post that you run into problems, since the normal submission route chokes on all the HEAD, BODY etc tags. This may well be fixed by turning on a filter.
HTML filtering helps a bit, but has some issues. The biggest issue being improper handling of newlines. If I turn on HTML filtering, new <BR \> tags are introduced which mess up the layout and/or break tags entirely if they span multiple lines.
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