====
- iRedMail version (check /etc/iredmail-release): 0.9.2
- Linux/BSD distribution name and version:  centos-6-x86_64
- Store mail accounts in which backend (LDAP/MySQL/PGSQL):  MySql
- Web server (Apache or Nginx): apache
- Manage mail accounts with iRedAdmin-Pro? no
- Related log if you're reporting an issue:
====
Hotmail can't receive messages and gmail goes to spam.   
here gmail log ..                                                                                                                                                                                                                                                         
Delivered-To: myemail@gmail.com
Received: by 10.31.220.133 with SMTP id t127csp5913949vkg;
        Sat, 26 Dec 2015 22:06:57 -0800 (PST)
X-Received: by 10.28.63.22 with SMTP id m22mr32297048wma.59.1451196417338;
        Sat, 26 Dec 2015 22:06:57 -0800 (PST)
Return-Path: <mina@mydomain.com>
Received: from mail.mydomain.com ([5.XXX.XXX.XX])
        by mx.google.com with ESMTP id v186si36876885wmb.62.2015.12.26.22.06.56
        for <myemail@gmail.com>;
        Sat, 26 Dec 2015 22:06:57 -0800 (PST)
Received-SPF: pass (google.com: domain of mina@mydomain.com designates 5.XXX.XXX.XX as permitted sender) client-ip=5.XXX.XXX.XX;
Authentication-Results: mx.google.com;
       spf=pass (google.com: domain of mina@mydomain.com designates 5.XXX.XXX.XX1 as permitted sender) smtp.mailfrom=mina@mydomain.com
Received: from mydomain.com (mail.mydomain.com [127.0.0.1])
    by mail.mydomain.com (Postfix) with ESMTPSA id A26D32121E
    for <myemail@gmail.com>; Sun, 27 Dec 2015 01:06:55 -0500 (EST)
MIME-Version: 1.0
Content-Type: text/plain; charset=US-ASCII;
format=flowed
Content-Transfer-Encoding: 7bit
Date: Sun, 27 Dec 2015 08:06:55 +0200
From: mina@mydomain.com
To: myemail@gmail.com
Subject: merry christmas
Message-ID: <17632543220f051b3e55ababd021e419@mydomain.com>
X-Sender: mina@mydomain.com
User-Agent: Roundcube Webmail

thanks :$
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my hosts : /etc/hosts
127.0.0.1 mail.mydomain.com mail localhost.localdomain localhost
5.XXX.XXX.XX mail.mydomain.com mail
::1 localhost
--------
/etc/sysconfig/network
NETWORKING="yes"
GATEWAYDEV="venet0"
HOSTNAME="mail.mydomain.com"
--------
hostname -f and hostname --fqdn output mail.mydomain.com
--------
also hostname reset to localhost.localdomain evey reboot ....
please help as soon as possible