Email structure causing blank content on Hotmail

[humandesigner]

Hello,

Could someone be kind enough to tell me what's wrong with the email's source code displayed below?

Its content gets displayed normally seemingly everywhere with the exception of Hotmail which makes it appear totally blank.

Any idea?
(BTW, this email is constructed by some PHP code of mine)

Thanks!

Return-Path: <some_person@some_mail.com>
Received: from swip.net (mailfe03.myISP.com [111.111.111.11])
by some_mail.com (8.12.8/8.12.8) with ESMTP id k22KWNrs001937
for <some_person@some_mail.com>; Thu, 2 Mar 2006 15:32:23 -0500
X-T2-Posting-ID: vEzoMb1+SBed3+c9tE6uUatr+BFi1uwAz1j04Ppl/Nk=
X-Cloudmark-Score: 0.000000 []
Received: from [111.111.111.11] (HELO some_person)
by mailfe03.swip.net (CommuniGate Pro SMTP 5.0.8)
with SMTP id 146431633 for some_person@some_mail.com; Thu, 02 Mar 2006 21:32:21 +0100
Subject: =?iso-8859-1?B?Vm90cmUgaW5zY3JpcHRpb24gOiB2YWxpZGF0aW9uIGVtYWls?=
To: some_person@some_mail.com
From: "some_person" <some_person@some_mail.com>
Reply-To: "some_person" <some_person@some_mail.com>
Date: Friday 3 March 2006, 5:18
MIME-Version: 1.0
X-Priority: 3
X-Mailer: mailer [V1]
Content-Type: multipart/alternative; boundary="----=_NextPart_d239c0ee61f7e417072ea81f113fc8f2"
Message-ID: <[e-mail]>

This is a multi-part message in MIME format.

------=_NextPart_d239c0ee61f7e417072ea81f113fc8f2
Content-Type: text/plain;charset="iso-8859-1
Content-Transfer-Encoding: 7bit

Some text from here ......
.............
.............
.............
...........
............
... to here.

------=_NextPart_d239c0ee61f7e417072ea81f

[StupidScript]

Maybe ...

Content-Type: text/plain;charset="iso-8859-1

should be

Content-Type: text/plain;charset=ISO-8859-1

Just thinking that the leading quote in the charset spec might cause Hotmail to 'think' the rest of the message is part of that spec, since there's no trailing quote. And I haven't seen "iso-" before, only "ISO-".

[humandesigner]

Thanks for the reply. :)

Unfortunately, the problem is still there even with the fixed quote. I've been searching for days but I see nothing special :(