Reiner Steib <reinersteib+gmane@imap.cc> writes:

> Without *any* kind of information what is kind of problem the
> "garbled" message/attachment has, it's next to impossible to help you.
> You might send such a message to gmane.test or send us a gzipped mbox
> of the received message.  Be sure not to include private stuff.

If Gnus cooperates, this message should include two enclosures: an
inline image (the Boost logo) and a forwarded email message.  The
original email message being forwarded contained a copy of the same
image (inline), and it was received cleanly.