Analysing email header from hotmail for message marked as spam

Question

I have a simple PHP script which generates a single email to a user on my site. For some reason, most messages are getting sent to user's spam folders. I set up a hotmail account to test this, and I'm now trying to analyse the header to check why it is getting added to the spam folder.

The header I am getting is included below. There doesn't appear to be any information relating to spam (i.e. spamassassin). I'm wondering if anyone can detect what the issue might be?

x-store-info:4r51+eLowCe79NzwdU2kRyU+pBy2R9QCj0/8P6fDMVumMo6iGJG5XQGQsGw4y+KC5jGdX6A7+/ZVHRw3c8psWXtc+cAfssqe5kw3LdG9RbC+kh049fg5aL5vFishJNonRedbn/JCR2Y=
Authentication-Results: hotmail.com; sender-id=pass (sender IP is 208.53.158.38) header.from=info@****.com; dkim=pass header.d=****.com; x-hmca=pass
X-SID-PRA: info@****.com
X-Message-Status: n:0:n
X-SID-Result: Pass
X-DKIM-Result: Pass
X-AUTH-Result: PASS
X-Message-Delivery: Vj0xLjE7dXM9MDtsPTA7YT0wO0Q9MjtHRD0yO1NDTD02
X-Message-Info: M98loaK0Lo1tWPCbe4OE0UbDdVDXEICZZMNsQz6Wthy3jeg8lyZ+D9euQ2riH1WvmBV23btdBFelBmKMH/9LOMR9or7uhXgxLWPa0gAZnJxsZCwy+xyGPBu8cHXLoyzG0CR/fKSJcN+zLjJCNkZvew==
Received: from itchy.cirtexhosting.com ([208.53.158.38]) by COL0-MC2-F40.Col0.hotmail.com with Microsoft SMTPSVC(6.0.3790.4900);
     Sun, 22 Jul 2012 16:56:31 -0700
DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=****.com; s=default;
    h=Subject:To:From; bh=ZwVnoaT/AbcAu6/7wnV5p3ZMSyLI5Eg9h9kKTJTmUL4=;
    b=LTP74QdOU6Yt71wIr+J3PKWQUnGLUKRyU/Ps+ZM+OPgGOwfAeAvbPVemSl+dEh2u0VYtiuCdl5WvSK5zzQh+OV4KiBcy0xNj1vaRnBuUORgBY+SEIXu5TgLf3CbEZY0u;
Received: from itchy.cirtexhosting.com ([208.53.158.38]:26249 helo=localhost)
    by itchy.cirtexhosting.com with esmtpsa (TLSv1:AES256-SHA:256)
    (Exim 4.77)
    (envelope-from <info@****.com>)
    id 1St60G-0000kF-Oq
    for ****@hotmail.com; Sun, 22 Jul 2012 19:56:01 -0400
From: Marvelous Monthly Mix Up <info@****.com>
To: ****@hotmail.com
Subject: Welcome to the Marvelous Monthly Mix Up
X-AntiAbuse: This header was added to track abuse, please include it with any abuse report
X-AntiAbuse: Primary Hostname - itchy.cirtexhosting.com
X-AntiAbuse: Original Domain - hotmail.com
X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12]
X-AntiAbuse: Sender Address Domain - ****.com
X-Source: 
X-Source-Args: 
X-Source-Dir: 
Return-Path: info@****.com
Message-ID: <COL0-MC2-F40nkB4ltF00b5209d@COL0-MC2-F40.Col0.hotmail.com>
X-OriginalArrivalTime: 22 Jul 2012 23:56:31.0807 (UTC) FILETIME=[9E28C4F0:01CD6865]

Answer 1

The only way to truly prevent email from being marked as spam is to have your users create a filter for your email or to add you to their contacts list.

Included below are two resources that Google provides for emails that are marked as spam:

1. Why messages are marked as Spam
2. Legitimate mail is marked as spam

You can also try running an emailtest to check your content.

If you are using shared hosting then its possible that the IP address that your SMTP uses has been blacklisted. This can still happen if you're not on shared hosting but its more likely since you have a wide array of users from all areas.

"If it looks like a duck and quacks like a duck, then it's a duck." Try to make sure that you have good content quality and you should be able to do a search for assistance there.