I'm not so curious about the extra headers you're sending to PHP's mail function as I am about the actual email headers that get sent with the email. If you select the email in your hotmail account, right click, source, you should see some helpful information. eg.
Code:
X-Message-Delivery: Vj0xBjE7dXM9EFtsPTA7YT0wO0Q5MTtTQ0w9MA==
X-Message-Status: n:0
X-SID-PRA: MICROSOFT LIVE FORTUNE <msnexciteunit@excite.co.uk>
X-Message-Info: QY4hSA9XTJPYDSkY5fbyDeOBbmjMbJKJbWyA5RAQN9G+/XWNtLXWj2P4xzvOJxti6rPlXcTBSXbdzE/HdZvabKClSrtXGnZ/
Received: from malik.acsalaska.net ([207.112.153.224]) by bay0-mc11-f12.bay0.hotmail.com with Microsoft SMTPSVC(5.0.3750.2628);
Sun, 30 Nov 2008 13:14:26 -0800
Received: from mymail.acsalaska.net (sheep.acsalaska.net [216.67.61.194])
by malik.acsalaska.net (8.14.1/8.14.1) with ESMTP id mAULEPaI012327;
Sun, 30 Nov 2008 12:14:25 -0900 (AKST)
(envelope-from msnexciteunit@excite.co.uk)
Received: from 41.220.75.3
(SquirrelMail authenticated user
industrial.insulation@acsalaska.net)
by mymail.acsalaska.net with HTTP;
Sun, 30 Nov 2008 12:14:26 -0900 (AKST)
Message-ID: <26713.41.210.73.3.1238084565.squirrel@mymail.acsalaska.net>
Date: Sun, 30 Nov 2008 12:14:26 -0900 (AKST)
Subject: MLF/036.12.1625
From: "MICROSOFT LIVE FORTUNE" <msnexciteunit@excite.co.uk>
Reply-To: verificationcenter@live.co.uk
User-Agent: SquirrelMail/1.4.13
MIME-Version: 1.0
Content-Type: text/plain;charset=iso-8859-1
Content-Transfer-Encoding: 8bit
X-Priority: 3 (Normal)
Importance: Normal
To: undisclosed-recipients:;
X-ACS-Spam-Status: yes
X-ACS-Spam-Score: 7.961 (xxxxxxx)
X-ACS-Spam-Tests: DEAR_WINNER,KAM_LOTTO1,LOTTERY_PH_004470,
X-ACS-Scanned-By: MD 2.63; SA 3.2.3; spamdefang 1.122
Return-Path: msnexciteunit@excite.co.uk
X-OriginalArrivalTime: 30 Nov 2008 21:14:26.0956 (UTC) FILETIME=[A04AC4C0:01C95330]
Also, if the settings are at "exclusive" the email will go to the junk folder no matter what you do until the account adds the address to the "whitelist".
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