db/message: accept attachments of type pgp-encrypted

In case of a '.gpg' file being attached to a non-encrypted email some
email clients (like thunderbird) will mark this attachment as content
type 'application/pgp-encrypted'. Alot used to discard that mime part
because the same content type is being used in PGP/MIME to signal de
version:
https://tools.ietf.org/html/rfc3156#section-6.1

Now alot differenciates two cases:

* Normal PGP/MIME encrypted messages, where we need to discard the
  'application/pgp-encrypted' mime part. Detected because this part is
  followed by a 'application/octet-stream' mime part.
* A mime part with aplication/pgp-encrypted as content type, that is
  displayed as attachment.

0 files changed, 0 insertions, 0 deletions