[Tickets #10169] Some mails can't be displayed

[bugs at horde.org]

DO NOT REPLY TO THIS MESSAGE. THIS EMAIL ADDRESS IS NOT MONITORED.

Ticket URL: http://bugs.horde.org/ticket/10169
------------------------------------------------------------------------------
  Ticket             | 10169
  Created By         | jacob-horde at vindvejr.dk
  Summary            | Some mails can't be displayed
  Queue              | IMP
  Version            | 5.0.5
  Type               | Bug
  State              | Unconfirmed
  Priority           | 2. Medium
  Milestone          |
  Patch              |
  Owners             |
+New Attachment     | imp-mail.png
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jacob-horde at vindvejr.dk (2011-06-01 16:57) wrote:

Some mails are simply displayed as:
ÿþ

and nothing else (see screenshot). The mails that can't be displayed  
doesn't seem to have much in common: one is base64 encoded:

-->
[...]
Subject:  
=?utf-8?B?UmU66LK35a625bey5L+u5pS557Wm5oKo55qE5L+h55So6KmV5YO577yaU0QvTWljcm9TRC9NaW5pU0QvTU1DIE1lbW9yeSBDYXJkIFJlYWRlciBVU0IgMi4wIC0gVUvvvIgyNjA3NzEzNjgxOTPvvIk=?=
Content-Type: text/html; charset=utf-8
Content-Transfer-Encoding: base64

PCFET0NUWVBFIEhUTUwgUFVCTElDICItLy9XM0MvL0RURCBIVE1MIDQuMCBUcmFuc2l0aW9u
[...]
<--

and another one is not:
-->
[...]
Content-Type: multipart/alternative;
	boundary="----_=_NextPart_001_01CC1B6F.66B13F22"
Subject: SV: SV: Anne og job
[...]

This is a multi-part message in MIME format.

------_=_NextPart_001_01CC1B6F.66B13F22
Content-Type: text/plain;
	charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable

Hey min ven!
[...]
<--

Clicking "Text part" will display it in the same way, just in a new  
window. I can mail the raw mails, but prefer not to upload them here.

Thunderbird displays them fine, and I haven't experienced the problem  
before IMP 5.0.4.