Comment 2 for bug 612111

This works in opposite too. When I forward more than one message, VM does a very nice thing and makes a digest of the marked messages. The problem is, it inserts a new line after the border of each digest part:

--56HD+tjpq5
Content-Type: multipart/digest; boundary="coV+5jrhX5"
Content-Transfer-Encoding: 7bit

This is a digest, 2 messages, MIME encapsulation.

--coV+5jrhX5

MIME-Version: 1.0
Content-Type: multipart/alternative;
 boundary="----=_NextPart_000_0017_01CB3494.494390C0"

If the message is encoded in non-ascii (iso-2022-jp in this case) then another client (gmail here) might not know that and show garbled text, if not then it will simply show the headers (sort of unpleasent).