[SM-I18N] iso-2022-jp subject line getting munged when using reply or forward

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I'm using SquirrelMail 1.4.3a-1 on RedHat EL 3.0 in a Japanese language=20
environment.  Mostly it is working without issue, however recently one=20
of my users pointed out that their subject was munged when replying.

this is the comment from the user: (in japanese)
=E4=BB=B6=E5=90=8D=E3=81=8C=E3=82=82=E3=81=A8=E3=82=82=E3=81=A8=E3=81=AF=E3=
=80=8C=E6=B8=AC=E7=94=A8URL=E7=99=BA=E8=A1=8C=E3=81=AE=E5=BE=A1=E9=A1=98=E3=
=81=84=E3=80=8D=E3=81=AA=E3=81=AE=E3=81=AB=E3=80=81=E8=BF=94=E4=BF=A1=E3=82=
=92=E3=81=99=E3=82=8B=E3=81=A8
=E3=81=93=E3=81=AE=E3=82=88=E3=81=86=E3=81=AB=E5=8C=96=E3=81=91=E3=81=A6=E3=
=81=97=E3=81=BE=E3=81=BE=E3=81=99=E3=80=82
=E3=80=8CRe: =E6=B8=AC=E7=94=A8URL=3D ?ISO-2022-JP?B?GyRCSC85VCROOGY0aiQk=
GyhC?=3D=E3=80=8D

after doing some testing I've been able to reproduce a similar issue.
it appears that for some reason extra spaces and a carriage-return are=20
being inserted into the Subject: header.  I'm not a PHP programmer, but=20
I've looked through the code and have yet to be able to determine where=20
this is happening.  In my test case, I used an email with the following=20
subject:

WEB=E3=83=A1=E3=83=BC=E3=83=AB=E3=81=AE=E4=BB=B6=E5=90=8D=E3=81=8C=E5=8C=96=
=E3=81=91=E3=81=BE=E3=81=99

during my reply / forwarding tests I've seen the following in the headers=
:

Return-Path: <apr...@my...>
Received: from mail.mydomain.tld (mail.mydomain.tld [xxx.xxx.xxx.25])
	by mojo.12inch.com (8.13.1/8.13.0) with ESMTP id iB818INF002655
	(version=3DTLSv1/SSLv3 cipher=3DDHE-RSA-AES256-SHA bits=3D256 verify=3DF=
AIL)
	for <al...@12...>; Wed, 8 Dec 2004 10:08:20 +0900
Received: from mail.mydomain.tld (localhost.localdomain [127.0.0.1])
	by mail.mydomain.tld (8.13.1/8.13.1) with ESMTP id iB8166HS011355
	(version=3DTLSv1/SSLv3 cipher=3DDHE-RSA-AES256-SHA bits=3D256 verify=3DN=
O)
	for <al...@12...>; Wed, 8 Dec 2004 10:06:06 +0900
Received: (from apache@localhost)
	by mail.mydomain.tld (8.13.1/8.13.1/Submit) id iB81663u011354;
	Wed, 8 Dec 2004 10:06:06 +0900
Received: from 203.131.192.247
         (SquirrelMail authenticated user apremselaar);
         by mail.mydomain.tld with HTTP;
         Wed, 8 Dec 2004 10:06:06 +0900 (JST)
Message-ID: <51706.203.131.192.247.1102467966.squirrel@203.131.192.247>
Date: Wed, 8 Dec 2004 10:06:06 +0900 (JST)
Subject: [Fwd: WEB=3D?ISO-2022-JP?B?GyRCJWEhPCVrJE43b0w+JCwyPSQxJF4kORsoQ=
g=3D=3D?=3D
      ]
From: apr...@my...
To: al...@12...
User-Agent: SquirrelMail/1.4.3a-1
X-Mailer: SquirrelMail/1.4.3a-1
MIME-Version: 1.0
Content-Type: text/plain;charset=3Diso-2022-jp
Content-Transfer-Encoding: 7bit
X-Priority: 3 (Normal)
Importance: Normal
X-Spam-Scanner: SpamAssassin 3.000001 (http://www.spamassassin.org/) on=20
mojo.12inch.com
X-Spam-Score: -2.467 / 4.000: 22.533%
X-Spam-Tests: AWL(0.125),NO_REAL_NAME(0.007),BAYES_00(-2.599)
X-Scanned-By: MIMEDefang 2.49 on 64.7.201.48

** NOTE: when i look at the header in my mail client (thunderbird, or=20
Squirrelmail 1.4.3a-1) the Subject header does not have a CRLF before=20
the word "WEB" ... it appears to have line-wrapped when I pasted it.
the CRLF and spaces between the last character of the encoded subject=20
and the ']' are showing up in the header view or source view of my mail=20
client(s)

I've changed the domain-name and IP address information for my company's=20
mailserver but have made no other changes to the header information.

out-bound mail from the company network does not pass thru SpamAssassin,=20
but is scanned with ClamAV 8.0 anti-virus software. I'm running Sendmail=20
8.13.1 with MIMEDefang milter.  I'm not doing any message rebuilding=20
within MIMEDefang.

any assistance is greatly appreciated.

Thank you,

alan