[horde] Some emails causing blank (white/empty) inbox--messages dissappear - until those messages are deleted (Horde3/IMP)

[Support]

Description of problem:
  It seems that certain emails trigger this problem.  When looking at the
inbox, no messages appear, but it still shows that there are emails (e.g.
showing 1 - 10 of 1000).    
  Paging works in that if you visit another (e.g. 11 - 20 of 1000) where
there are none of these emails are displayed, then the inbox shows the
emails normally.
  By turning the paging down to display 1 email per page, I discovered that
certain emails seem to be tied to this problem.  As I navigate to a
problematic email, it goes blank, but all the other emails are fine.
  There are some other issues going on, but will list those separately (not
sure if related)
  I believe this problem is related to my particular setup/configuration.

Recent changes made:  
  Upgraded to latest version of Horde3.  
  We did upgrade to the latest PHP, but that seem to have other problems, so
we rolled back.


Configuration:
   freebsd 6.2, apache 1.3.37, php  5.1.6, mysql  4.1.22


Severity/coverage:
  It affects several accounts and seems to be solely caused by certain
emails:
  Emails do not have problems with Thunderbird, Outlook, or other desktop
clients.  If I delete using IMAP, then all is fixed in the webmail.
  I did have one similar report of this long before the upgrade, but not
sure if it was the same problem.  I had her just download her email via POP
and was working again (I assumed malformed emails).


Recognized patterns:   
  I discovered that the main differnece between these faulty emails and the
working ones is that the subject line for the bad emails look like this:

	Subject:
=?ISO8859-1?Q?Your_enrollment_in_ClientLine=AE_is_approved?=
	Subject: =?koi8-r?B?8NLJyM/EydTF?=

  As you can see, the extra characters such as the equals sign "=" , the
question mark "?" and the encoding type 
   I realize that both of these samples are SPAM.  Perhaps bad SPAM is part
of the problem.


Full email headers follow form two sample problem emails (actual domain
anmes have been changed to protect the innocent). If you need samples of
working emails, I can send those too.

============================================================================
============================================================================
==

Return-Path: <ntpo at norcom.ru>
Delivered-To: mydomaintcom-temp at mydomain.com
Received: (qmail 19436 invoked by uid 1009); 9 Apr 2008 15:29:05 -0000
Delivered-To: MYDOMAIN-mm at MYDOMAIN.com
Received: (qmail 19434 invoked by uid 1009); 9 Apr 2008 15:29:05 -0000
Received: by simscan 1.1.0 ppid: 19095, pid: 19359, t: 6.7186s
         scanners: attach: 1.1.0 clamav: 0.92.1
/m: spam: 3.2.3
X-Spam-Checker-Version: SpamAssassin 3.2.3 (2007-08-08) on
	bsd3.mytechsupport.com
X-Spam-Level: ****
X-Spam-Status: No, score=4.5 required=5.0 tests=BAYES_80,
	RAZOR2_CF_RANGE_51_100,RAZOR2_CF_RANGE_E4_51_100,RAZOR2_CHECK
autolearn=no
	version=3.2.3
Received: from pop-catel-2-181.azeronline.com (HELO dns) (62.217.141.181)
  by 0 with SMTP; 9 Apr 2008 15:28:58 -0000
Received-SPF: softfail (0: transitioning SPF record at norcom.ru does not
designate 62.217.141.181 as permitted sender)
Received: from [62.217.141.181] by mx1.norcom.ru; Wed, 9 Apr 2008 19:30:21
+0400
From: =?koi8-r?B?IuXQycbBziDkwc7P1yI=?= <ntpo at norcom.ru>
To: <mm at MYDOMAIN.com>
Subject: =?koi8-r?B?8NLJyM/EydTF?=
Date: Wed, 9 Apr 2008 19:30:21 +0400
Message-ID: <01c89a78$26af6100$b58dd93e at ntpo>
MIME-Version: 1.0
Content-Type: text/plain;
	charset="koi8-r"
Content-Transfer-Encoding: 8bit
X-Priority: 3 (Normal)
X-MSMail-Priority: Normal
X-Mailer: Microsoft Outlook, Build 10.0.4510
X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1807
Importance: Normal
X-Antivirus: avast! (VPS 080409-0, 04/09/2008), Inbound message
X-Antivirus-Status: Clean

 
============================================================================
============================================================================
==



Return-Path: <wellsfargo at myclientline.net>
Delivered-To: MYDOMAINcom-editor at MYDOMAIN.com
Received: (qmail 84651 invoked by uid 1009); 8 Apr 2008 08:05:32 -0000
Received: by simscan 1.1.0 ppid: 84615, pid: 84621, t: 3.1347s
         scanners: attach: 1.1.0 clamav: 0.92.1
/m: spam: 3.2.3
X-Spam-Checker-Version: SpamAssassin 3.2.3 (2007-08-08) on
	bsd3.mytechsupport.com
X-Spam-Level: 
X-Spam-Status: No, score=-1.1 required=5.0 tests=BAYES_00,HTML_MESSAGE,
	MIME_HTML_ONLY autolearn=no version=3.2.3
Received: from mail01.firstdatacorp.com (204.124.84.54)
  by 0 with SMTP; 8 Apr 2008 08:05:29 -0000
Received-SPF: none (0: domain at myclientline.net does not designate
permitted sender hosts)
Received: from ([204.124.84.49])
	by mail01.firstdatacorp.com with SMTP  id KP-TRPV1.440330739;
	Mon, 07 Apr 2008 23:05:55 -0500
Received: from mail1.firstdatacorp.com (204.124.84.45)
	by srvsig02.firstdatacorp.com (Sigaba Gateway v4.1)
	with ESMTP id 75182302; Mon, 07 Apr 2008 23:05:31 -0500
Received: from aopclspa ([170.186.253.207])
          by srvari01p.1dc.com (Lotus Domino Release 6.5.2)
          with ESMTP id 2008040723081806-9806609 ;
          Mon, 7 Apr 2008 23:08:18 -0500 
Message-ID: <1380064567.1207627575559.JavaMail.wasup at aopclspa>
From: WellsFargo at myclientline.net
To: EDITOR at MYDOMAIN.COM
Subject: =?ISO8859-1?Q?Your_enrollment_in_ClientLine=AE_is_approved?=
Mime-Version: 1.0
X-MIMETrack: Itemize by SMTP Server on SRVARI01P/FDC(Release 6.5.2|June 01,
2004) at 04/07/2008
 11:08:18 PM,
	Serialize by Router on SRVSMTP01/FDC(Release 6.5.1|January 21, 2004)
at 04/07/2008
 11:11:52 PM,
	Serialize complete at 04/07/2008 11:11:52 PM
Date: Mon, 7 Apr 2008 23:08:18 -0500
Content-Transfer-Encoding: 7bit
Content-Type: text/html
X-Antivirus: avast! (VPS 080409-0, 04/09/2008), Inbound message
X-Antivirus-Status: Clean
.