Hi,

I was made aware, that you could "enter" digests and forwards with C-d 
from the summary buffer.

This does not work with mimified forwards (multipart/mixed with a
message/rfc822 part). Gnus itself produces (with TM, if that matters)
such forwards, so it should probably understand them as well. I fixed
this by adding recognition of "multipart/mixed" as a possible
mime-"digest".

Still, the undigested result did not have the right headers (i.e. mime 
headers instead of rfc822 headers), so I added another line. Now
headers are in the right place, which makes replying to
message/rfc822-parts possible. Sadly, the digest-group-summary still
shows nothing useful (e.g. "[(none)]: (none)").

A patch is below.

	Robbe