Postfix, Dovecot Mail arrive en spam

Bonjour, tous le monde voila je demande votre aide car j’ai créer un serveur postfix , dovecot et mes mails arrivent en spam quand je les envoies.
Source d’un mail envoyer sur mon gmail

Delivered-To: deevorATgmail.com
Received: by 10.96.90.202 with SMTP id by10csp517971qdb;
        Sat, 31 Jan 2015 01:19:22 -0800 (PST)
X-Received: by 10.140.109.99 with SMTP id k90mr12070477qgf.35.1422695962371;
        Sat, 31 Jan 2015 01:19:22 -0800 (PST)
Return-Path: <kevinATaartur.com>
Received: from aarturdotcom ([2607:5300:60:6ca::1])
        by mx.google.com with ESMTP id t74si937134qga.27.2015.01.31.01.19.21
        for <deevor@gmail.com>;
        Sat, 31 Jan 2015 01:19:22 -0800 (PST)
Received-SPF: permerror (google.com: domain of kevinATaartur.com uses a mechanism not recognized by this client. unknown  mechanisms: )) client-ip=2607:5300:60:6ca::1;
Authentication-Results: mx.google.com;
       spf=permerror (google.com: domain of kevinATaartur.com uses a mechanism not recognized by this client. unknown  mechanisms: )) smtp.mail=kevinATaartur.com
Received: by aarturdotcom (Postfix, from userid 33)
	id F3FB8BFFE1; Sat, 31 Jan 2015 04:19:20 -0500 (EST)
To: deevorATgmail.com
Subject: test
X-PHP-Originating-Script: 501:rcube.php
MIME-Version: 1.0
Content-Type: text/plain; charset=US-ASCII;
 format=flowed
Content-Transfer-Encoding: 7bit
Date: Sat, 31 Jan 2015 10:19:20 +0100
From: kevin <kevinATaartur.com>
Message-ID: <2d6e888a3a3133ee24825dc379a0b3fb@aarturdotcom>
X-Sender: kevinATaartur.com
User-Agent: Roundcube Webmail/1.0.5

Je ne comprend pas trop le problème
(pour info serveur dédie ovh et domaine chez goddady )
Merci d’avance pour votre aide