hvorfor bliver denne mail betragtet som spam?

Jeg sender nyheds mails til en gruppe mennesker, men de bliver betragtet som spam på fx gmail. Hvorfor?

Her er indholdet:

Delivered-To: herningreserve@gmail.com
Received: by 10.141.34.17 with SMTP id m17cs183591rvj;
        Mon, 20 Aug 2007 10:31:59 -0700 (PDT)
Received: by 10.86.57.9 with SMTP id f9mr4711772fga.1187631117827;
        Mon, 20 Aug 2007 10:31:57 -0700 (PDT)
Return-Path: <gn11@gullestrupnet.dk>
Received: from gn4.gullestrupnet.dk (gn4.gullestrupnet.dk [89.249.3.104])
        by mx.google.com with ESMTP id 31si10128307fkt.2007.08.20.10.31.54;
        Mon, 20 Aug 2007 10:31:57 -0700 (PDT)
Received-SPF: pass (google.com: domain of gn11@gullestrupnet.dk designates 89.249.3.104 as permitted sender) client-ip=89.249.3.104;
Authentication-Results: mx.google.com; spf=pass (google.com: domain of gn11@gullestrupnet.dk designates 89.249.3.104 as permitted sender) smtp.mail=gn11@gullestrupnet.dk
Received: from [89.249.3.111] by gn4.gullestrupnet.dk [89.249.3.104] with SmartMax MailMax for herningreserve@gmail.com; Mon, 20 Aug 2007 19:31:53 +0200
Return-Path: <gn11@gullestrupnet.dk>
X-SmartMax-AuthUser:
Date: Mon, 20 Aug 2007 19:31:54 +0200
From: gn11@gullestrupnet.dk
Subject: My Subject
To: herningreserve@gmail.com
Message-ID: <1187631114.15139@gn4.gullestrupnet.dk>

testbesked
-------------------------
Der er tale om en helt frisk oprettet Gmail konto.