Good day, I new here, hope I'm making the right way of posting my Problem...

Anyway, I have a problem with sending email to GMail and YahooMail, and probably others to.. If I send Email Via admin account of Zimbra, it won't go to SPAM, however if I use one of the accounts that I created, the Email would go directly to SPAM...here the full message

Code:
Delivered-To: rgpdeguma@gmail.com
Received: by 10.220.157.199 with SMTP id c7cs127633vcx;
        Thu, 24 Feb 2011 00:00:02 -0800 (PST)
Received: by 10.90.247.29 with SMTP id u29mr1508811agh.150.1298534402554;
        Thu, 24 Feb 2011 00:00:02 -0800 (PST)
Return-Path: <admin@fdamindanao.dyndns.org>
Received: from themail.fdamindanao.dyndns.org ([119.92.247.181])
        by mx.google.com with ESMTP id w15si19606037anw.118.2011.02.24.00.00.00;
        Thu, 24 Feb 2011 00:00:01 -0800 (PST)
Received-SPF: neutral (google.com: 119.92.247.181 is neither permitted nor denied by best guess record for domain of admin@fdamindanao.dyndns.org) client-ip=119.92.247.181;
Authentication-Results: mx.google.com; spf=neutral (google.com: 119.92.247.181 is neither permitted nor denied by best guess record for domain of admin@fdamindanao.dyndns.org) smtp.mail=admin@fdamindanao.dyndns.org
Received: from localhost (localhost [127.0.0.1])
	by themail.fdamindanao.dyndns.org (Postfix) with ESMTP id D5DE11081E36
	for <rgpdeguma@gmail.com>; Thu, 24 Feb 2011 15:59:58 +0800 (PHT)
X-Virus-Scanned: amavisd-new at fdamindanao.dyndns.org
Received: from themail.fdamindanao.dyndns.org ([127.0.0.1])
	by localhost (themail.fdamindanao.dyndns.org [127.0.0.1]) (amavisd-new, port 10024)
	with ESMTP id o5j+G95aLBj5 for <rgpdeguma@gmail.com>;
	Thu, 24 Feb 2011 15:59:58 +0800 (PHT)
Received: from themail.fdamindanao.dyndns.org (TheMail.fdamindanao.dyndns.org [172.16.1.3])
	by themail.fdamindanao.dyndns.org (Postfix) with ESMTP id 49BF71081E34
	for <rgpdeguma@gmail.com>; Thu, 24 Feb 2011 15:59:58 +0800 (PHT)
Date: Thu, 24 Feb 2011 15:59:58 +0800 (PHT)
From: admin@fdamindanao.dyndns.org
To: rgpdeguma@gmail.com
Subject: tesgffjmfjmfhkj
Message-ID: <b23925e2-dad3-4d0f-bcec-4007e5131c62@TheMail>
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 7bit
MIME-Version: 1.0
X-Originating-IP: [192.168.1.164]
X-Mailer: Zimbra 7.0.0_GA_3077 (ZimbraWebClient - FF3.0 (Win)/7.0.0_GA_3077)