[imp] attachments not showed with IMP 5.0.18

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>> ----77ad52058a31e0e63bf
>> Content-Type: message/rfc822
>> Content-Disposition: inline
>> Content-Transfer-Encoding:
> 
> That empty Content-Transfer-Encoding is incorrect.  It is most likely
> causing the parsing code on the IMAP server to incorrectly identify
> all the parts in the forwarded message.
> 
> Note that this is NOT an issue that can be fixed in imp.  We determine
> the structure of a message via the IMAP BODYSTRUCTURE command.  If
> that command is giving us incorrect information, there is nothing we
> can do about it.
> 
> In short, that e-mailer (Sun Messenger Express) is sending broken MIME
> messages.

I am not sure about this. The imap server (Dovecot 2.0.x) seems return de BODYSTRUCTURE correctly, at least Thunderbird is able to visualize that message.

* 3 FETCH (BODYSTRUCTURE (("text" "plain" ("charset" "iso-8859-1") NIL NIL "quoted-printable" 26 2 NIL ("inline" NIL) NIL NIL)("message" "rfc822" NIL NIL NIL "" 70162 ("Wed, 08 Feb 2012 12:42:09 +0100" "Fwd: 7" (("=?ISO-8859-1?Q?Jos=E9?=" NIL "anyuser" "services.corp.com")) (("=?ISO-8859-1?Q?Jos=E9?=" NIL "anyuser" "services.corp.com")) (("=?ISO-8859-1?Q?Jos=E9?=" NIL "anyuser" "services.corp.com")) (("friend at example.com" NIL "friend" "example.com")) NIL NIL "<fa1ae73447fc.4f326a87 at example.com>" "<4F325F91.1020202 at services.corp.com>") (("text" "plain" ("charset" "ISO-8859-1" "format" "flowed") NIL NIL "quoted-printable" 1463 31 NIL NIL NIL NIL)("image" "jpeg" ("name" "books.jpg") NIL NIL "base64" 65990 NIL ("attachment" ("filename" "books.jpg")) NIL NIL) "mixed" ("boundary" "------------030702010400040005080305") NIL NIL NIL) 975 NIL ("inline" NIL) NIL NIL) "mixed" ("boundary" "--77ad52058a31e0e63bf") NIL ("gl") NIL))

also, I did a (deseperate) test fixing manually the Content-Transfer-Encoding field:

# diff /tmp/1328701542.M402642P24917.imap1\,S\=71708\,W\=72742\:2\,S 1328701542.M402642P24917.map1\,S\=71708\,W\=72742\:2\,S
56c56
< Content-Transfer-Encoding: 
---
> Content-Transfer-Encoding: quoted-printable

and Dovecot returns exactly the same BODYSTRUCTURE.

So ... why, with the above BODYSTRUCTURE, thunderbid can show all attachments and IMP is not able to show it?