Why does this not display properly for me?  (I'm not particularly
bothered about seeing this spam, but I'm concerned about genuine
mails...)  I see the message as if it were a multipart/mixed
containing one text/plain part, beginning with

Anon> --------------27BEBD72CFE816D2DAE0A30E
Anon> Content-Type: text/plain; charset=us-ascii
Anon> Content-Transfer-Encoding: 7bit

and ending with

Anon> FVRWi3+FfkcUWqD0q7BfppgKVRHQdEX37jAWUSVs0iUAMSjwIP8AzVkAG0lCFo+4rloaFh9I+Awr
Anon> axvT9q4UbrRSvw9fbFFLw0nEih4nvTFX/9k=
Anon>
Anon> --------------329329E610BEF8140BC1E45B--
Anon>
Anon> --------------27BEBD72CFE816D2DAE0A30E--

If I C-d on the article, I get the right structure:

> R +[ HatterasOnMyMind co: 492 ] <* mixed> Virtual Vacations!!! ... from HatterasOnMyMind.com
> R + [ HatterasOnMyMind co: 486 ] <1.* alternative>
> R +  [ HatterasOnMyMind co: 463 ] <1.2.* related>
>   +   [ HatterasOnMyMind co: 20  ] <1.2.1 html>
> R +   [ HatterasOnMyMind co: 430 ] <1.2.2 jpeg>
> R +  [ HatterasOnMyMind co: 13  ] <1.1 text>

Selecting the <1.* alternative> part gives me the raw message text,
but anything deeper than that works correctly.

Is it something to do with the InterScan_NT filter used by our
mail gateway?  (Perhaps the ^M at the end of the "Content-Type:
multipart/alternative" header).

Or is it a Gnus bug (5.8.8 on Emacs 20.7, from Debian "testing"
distribution)?

Here's the message as it arrived here, after being mangled by the
gateway (I've truncated the image data to reduce message size - but
that's not relevant here).