Any other suggestions to fix this problem? This is kind of a show
stopper for us. We'll probably have to delay our migration to Horde 4
if we can't find out whether this is a bug or some misconfiguration on
our side.

If the message format is correct, then your IMAP server is returning
invalid data. If you can provide a message source of such a message, and
an IMAP log of loading such a message, we could maybe tell you more.

Sure, I've attached a sample HTML message generated by Horde4 and the IMAP log of the message. I removed stuff from the IMAP which seemed to be related to other private messages, if you need the complete log I can send it to you privately.
--
IKM-Serviceteam der Philosophischen Fakultät
HHU Düsseldorf
>1346235127>* 2133 FETCH (UID 104118 ENVELOPE ("Wed, 29 Aug 2012 12:01:13 +0200" "this is a html sample message" (("Jens Pranaitis" NIL "pranaitis" "phil-fak.uni-duesseldorf.de")) (("Jens Pranaitis" NIL "pranaitis" "phil-fak.uni-duesseldorf.de")) (("Jens Pranaitis" NIL "pranaitis" "phil-fak.uni-duesseldorf.de")) ((NIL NIL "pranaitis" "phil.hhu.de")) NIL NIL NIL "<20120829120113.horde.emkoee0spptqpehpjkfg...@webmail2.phil-fak.uni-duesseldorf.de>"))
3 OK Completed (0.000 sec)
<1346235127<4 UID FETCH 104118 (BODYSTRUCTURE)<1346235127<
>1346235127>* 2133 FETCH (UID 104118 BODYSTRUCTURE (("TEXT" "PLAIN" ("CHARSET" "ISO-8859-1" "FORMAT" "flowed" "DELSP" "Yes") NIL "Plaintext Message" "7BIT" 28 2 NIL ("INLINE" NIL) NIL NIL)("TEXT" "HTML" ("CHARSET" "ISO-8859-1") NIL "HTML Message" "7BIT" 217 10 NIL ("INLINE" NIL) NIL NIL) "ALTERNATIVE" ("BOUNDARY" "=_G5O9Bu0spPtQPehpjiMQqAA") NIL NIL NIL))
4 OK Completed (0.000 sec)
<1346235127<5 SELECT INBOX<1346235127<
>1346235127>* OK [CLOSED] Ok
* 2133 EXISTS
* 0 RECENT
* FLAGS (\Answered \Flagged \Draft \Deleted \Seen Junk NotJunk KMAILFORWARDED KMAILTODO KMAILWATCHED KMAILIGNORED $FORWARDED $TODO $WATCHED $IGNORED receipt-handled NonJunk $ATTACHMENT $MDNSent)
* OK [PERMANENTFLAGS (\Answered \Flagged \Draft \Deleted \Seen Junk NotJunk KMAILFORWARDED KMAILTODO KMAILWATCHED KMAILIGNORED $FORWARDED $TODO $WATCHED $IGNORED receipt-handled NonJunk $ATTACHMENT $MDNSent \*)] Ok
* OK [UIDVALIDITY 1281943107] Ok
* OK [UIDNEXT 104120] Ok
* OK [HIGHESTMODSEQ 157164] Ok
* OK [URLMECH INTERNAL] Ok
5 OK [READ-WRITE] Completed
<1346235127<6 UID FETCH 104118 (BODY[HEADER])<1346235127<
>1346235127>* 2133 FETCH (UID 104118 BODY[HEADER] {1863}
Return-Path: <pranai...@phil-fak.uni-duesseldorf.de>
Received: from smtp2.phil-fak.uni-duesseldorf.de (smtp2.phil-fak.uni-duesseldorf.de [134.99.24.106])
	 by sokrates (Cyrus v2.4.16) with LMTPA;
	 Wed, 29 Aug 2012 12:01:13 +0200
X-Sieve: CMU Sieve 2.4
Received: from smtp2.phil-fak.uni-duesseldorf.de (localhost [127.0.0.1])
	by smtp2.phil-fak.uni-duesseldorf.de (Postfix) with ESMTP id B683320091
	for <pranai...@phil.hhu.de>; Wed, 29 Aug 2012 11:59:40 +0200 (CEST)
X-DKIM: OpenDKIM Filter v2.0.1 smtp2.phil-fak.uni-duesseldorf.de B683320091
DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple;
	d=phil-fak.uni-duesseldorf.de; s=mail-out; t=1346234380;
	bh=G8MkwPyRCBIWKeJuRrJdmAC0Sz+cy6+KdAUEXH4LDhg=;
	h=Date:Message-ID:From:To:Subject:Content-Type:MIME-Version;
	b=kN7Nv1qx/cO/UblFmqA4ed2ZPztXa13Gule2MVZFRyiI/muhyCY4kPkLaFEhPhH1i
	 72W+5n5WHO1yWS9KLAIUHjhsu6MkR7dnCIE2yLHpZcKwwcu9/xXa2lWI/87rbRSGyr
	 /J5lkU4ZUiQEivr/pjovWZR9K7KnjJa/8pZjUl+E=
Received: from localhost (webmail2.phil-fak.uni-duesseldorf.de [134.99.24.101])
	by smtp2.phil-fak.uni-duesseldorf.de (Postfix) with ESMTPA id 91C0320090
	for <pranai...@phil.hhu.de>; Wed, 29 Aug 2012 11:59:40 +0200 (CEST)
Received: from sna-lnx3.phil-fak.uni-duesseldorf.de
 (sna-lnx3.phil-fak.uni-duesseldorf.de [134.99.58.10]) by
 webmail2.phil-fak.uni-duesseldorf.de (Horde Framework) with HTTP; Wed, 29
 Aug 2012 12:01:13 +0200
Date: Wed, 29 Aug 2012 12:01:13 +0200
Message-ID: <20120829120113.horde.emkoee0spptqpehpjkfg...@webmail2.phil-fak.uni-duesseldorf.de>
From: Jens Pranaitis <pranai...@phil-fak.uni-duesseldorf.de>
To: pranai...@phil.hhu.de
Subject: this is a html sample message
User-Agent: Internet Messaging Program (IMP) H4 (5.0.23)
Content-Type: multipart/alternative; boundary="=_G5O9Bu0spPtQPehpjiMQqAA"
MIME-Version: 1.0
X-Virus-Scanned: ClamAV using ClamSMTP

)
6 OK Completed (0.000 sec)
<1346235127<7 UID FETCH 104118 (BINARY.PEEK[1])<1346235127<
>1346235127>* 2133 FETCH (UID 104118 BINARY[1] {28}
Hey,
this is just a test.
)
7 OK Completed (0.000 sec)
<1346235127<8 UID FETCH 104118 (BINARY.PEEK[2])<1346235127<
>1346235127>* 2133 FETCH (UID 104118 BINARY[2] {217}
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title></title>
</head>
<body style="font-family:Arial;font-size:14px">
<p><br>
Hey,<br>
this is just a test.</p>
</body>
</html>)
8 OK Completed (0.010 sec)
<1346235127<9 LIST (SUBSCRIBED) "" (INBOX.* user.* *) RETURN (SUBSCRIBED)<1346235127<
>1346235127>* LIST (\Subscribed \HasChildren) "." INBOX.Archives
* LIST (\Subscribed) "." INBOX.Archives.2010
* LIST (\Subscribed) "." INBOX.Archives.2011
* LIST (\Subscribed) "." INBOX.Archives.2012
* LIST (\Subscribed) "." INBOX.Drafts
* LIST (\Subscribed) "." INBOX.Entw&APw-rfe
* LIST (\Subscribed) "." "INBOX.Gesendete Objekte"
* LIST (\Subscribed) "." INBOX.Junk
* LIST (\Subscribed) "." INBOX.Papierkorb
* LIST (\Subscribed) "." INBOX.Sent
* LIST (\Subscribed) "." INBOX.Spam
* LIST (\Subscribed) "." INBOX.Spamverdacht
* LIST (\Subscribed) "." INBOX.Templates
* LIST (\Subscribed) "." INBOX.Trash
* LIST (\Subscribed) "." INBOX.apt-listchanges
* LIST (\Subscribed) "." INBOX.blogfarm
* LIST (\Subscribed) "." INBOX.clam
* LIST (\Subscribed) "." INBOX.cron
* LIST (\Subscribed) "." INBOX.dsa
* LIST (\Subscribed) "." INBOX.gollem
* LIST (\Subscribed) "." INBOX.hosttab
* LIST (\Subscribed) "." INBOX.imp
* LIST (\Subscribed) "." INBOX.keinspam
* LIST (\Subscribed) "." INBOX.lists
* LIST (\Subscribed) "." INBOX.log-analysis
* LIST (\Subscribed) "." INBOX.mail-fail
* LIST (\Subscribed) "." INBOX.medienlab
* LIST (\Subscribed) "." INBOX.nagios
* LIST (\Subscribed) "." INBOX.openbsd
* LIST (\Subscribed) "." INBOX.rkhunter
* LIST (\Subscribed) "." INBOX.turba
* LIST (\Subscribed) "." INBOX.usn
* LIST (\Subscribed) "." INBOX.wiki
* LIST (\Subscribed \HasChildren) "." INBOX.Archives
* LIST (\Subscribed) "." INBOX.Archives.2010
* LIST (\Subscribed) "." INBOX.Archives.2011
* LIST (\Subscribed) "." INBOX.Archives.2012
* LIST (\Subscribed) "." INBOX.Drafts
* LIST (\Subscribed) "." INBOX.Entw&APw-rfe
* LIST (\Subscribed) "." "INBOX.Gesendete Objekte"
* LIST (\Subscribed) "." INBOX.Junk
* LIST (\Subscribed) "." INBOX.Papierkorb
* LIST (\Subscribed) "." INBOX.Sent
* LIST (\Subscribed) "." INBOX.Spam
* LIST (\Subscribed) "." INBOX.Spamverdacht
* LIST (\Subscribed) "." INBOX.Templates
* LIST (\Subscribed) "." INBOX.Trash
* LIST (\Subscribed) "." INBOX.apt-listchanges
* LIST (\Subscribed) "." INBOX.blogfarm
* LIST (\Subscribed) "." INBOX.clam
* LIST (\Subscribed) "." INBOX.cron
* LIST (\Subscribed) "." INBOX.dsa
* LIST (\Subscribed) "." INBOX.gollem
* LIST (\Subscribed) "." INBOX.hosttab
* LIST (\Subscribed) "." INBOX.imp
* LIST (\Subscribed) "." INBOX.keinspam
* LIST (\Subscribed) "." INBOX.lists
* LIST (\Subscribed) "." INBOX.log-analysis
* LIST (\Subscribed) "." INBOX.mail-fail
* LIST (\Subscribed) "." INBOX.medienlab
* LIST (\Subscribed) "." INBOX.nagios
* LIST (\Subscribed) "." INBOX.openbsd
* LIST (\Subscribed) "." INBOX.rkhunter
* LIST (\Subscribed) "." INBOX.turba
* LIST (\Subscribed) "." INBOX.usn
* LIST (\Subscribed) "." INBOX.wiki
9 OK Completed (0.000 secs 66 calls)
<1346235127<10 LIST "" (INBOX)<1346235127<
>1346235127>* LIST (\HasChildren) "." INBOX
10 OK Completed (0.000 secs 38 calls)
<1346235127<11 SEARCH RETURN (COUNT) UNSEEN<1346235127<
>1346235127>* ESEARCH (TAG "11") COUNT 0
11 OK Completed (0 msgs in 0.000 secs)
<1346235127<12 LOGOUT<1346235127<
>1346235127>* BYE LOGOUT received
12 OK Completed
Return-Path: <pranai...@phil-fak.uni-duesseldorf.de>
Received: from smtp2.phil-fak.uni-duesseldorf.de 
(smtp2.phil-fak.uni-duesseldorf.de [134.99.24.106])
         by sokrates (Cyrus v2.4.16) with LMTPA;
         Wed, 29 Aug 2012 12:01:13 +0200
X-Sieve: CMU Sieve 2.4
Received: from smtp2.phil-fak.uni-duesseldorf.de (localhost [127.0.0.1])
        by smtp2.phil-fak.uni-duesseldorf.de (Postfix) with ESMTP id B683320091
        for <pranai...@phil.hhu.de>; Wed, 29 Aug 2012 11:59:40 +0200 (CEST)
X-DKIM: OpenDKIM Filter v2.0.1 smtp2.phil-fak.uni-duesseldorf.de B683320091
DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple;
        d=phil-fak.uni-duesseldorf.de; s=mail-out; t=1346234380;
        bh=G8MkwPyRCBIWKeJuRrJdmAC0Sz+cy6+KdAUEXH4LDhg=;
        h=Date:Message-ID:From:To:Subject:Content-Type:MIME-Version;
        b=kN7Nv1qx/cO/UblFmqA4ed2ZPztXa13Gule2MVZFRyiI/muhyCY4kPkLaFEhPhH1i
         72W+5n5WHO1yWS9KLAIUHjhsu6MkR7dnCIE2yLHpZcKwwcu9/xXa2lWI/87rbRSGyr
         /J5lkU4ZUiQEivr/pjovWZR9K7KnjJa/8pZjUl+E=
Received: from localhost (webmail2.phil-fak.uni-duesseldorf.de [134.99.24.101])
        by smtp2.phil-fak.uni-duesseldorf.de (Postfix) with ESMTPA id 91C0320090
        for <pranai...@phil.hhu.de>; Wed, 29 Aug 2012 11:59:40 +0200 (CEST)
Received: from sna-lnx3.phil-fak.uni-duesseldorf.de
 (sna-lnx3.phil-fak.uni-duesseldorf.de [134.99.58.10]) by
 webmail2.phil-fak.uni-duesseldorf.de (Horde Framework) with HTTP; Wed, 29
 Aug 2012 12:01:13 +0200
Date: Wed, 29 Aug 2012 12:01:13 +0200
Message-ID: 
<20120829120113.horde.emkoee0spptqpehpjkfg...@webmail2.phil-fak.uni-duesseldorf.de>
From: Jens Pranaitis <pranai...@phil-fak.uni-duesseldorf.de>
To: pranai...@phil.hhu.de
Subject: this is a html sample message
User-Agent: Internet Messaging Program (IMP) H4 (5.0.23)
Content-Type: multipart/alternative; boundary="=_G5O9Bu0spPtQPehpjiMQqAA"
MIME-Version: 1.0
X-Virus-Scanned: ClamAV using ClamSMTP

This message is in MIME format.

--=_G5O9Bu0spPtQPehpjiMQqAA
Content-Type: text/plain; charset=ISO-8859-1; format=flowed; DelSp=Yes
Content-Description: Plaintext Message
Content-Disposition: inline

Hey,
this is just a test.

--=_G5O9Bu0spPtQPehpjiMQqAA
Content-Type: text/html; charset=ISO-8859-1
Content-Description: HTML Message
Content-Disposition: inline

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title></title>
</head>
<body style="font-family:Arial;font-size:14px">
<p><br>
Hey,<br>
this is just a test.</p>
</body>
</html>
--=_G5O9Bu0spPtQPehpjiMQqAA--
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