123@abc.com
    SMTP error from remote mail server after RCPT TO:<123@abc.com>:
    host mail.host.com [2.3.4.5]: 554 5.1.8 <apache@web01.domain.com>:
    Sender address rejected: MX record not found

------ This is a copy of the message, including all the headers. ------

Return-path: <apache@web01.domain.com>
Received: from apache by web01.domain.com with local (Exim 4.72)
    (envelope-from <apache@web01.domain.com>)
    id 1WYYsD-0004AX-QJ
    for 123@abc.com; Fri, 11 Apr 2014 10:39:53 +0000
Date: Fri, 11 Apr 2014 10:39:53 +0000
Message-Id: <E1WYYsD-0004AX-QJ@web01.domain.com>
To: 123@abc.com
Subject: Password reset
X-PHP-Originating-Script: 501:password-forgotten.php
From: application@domain.com

A
domain.com  0   3600    A    1.2.3.4
www.domain.com  0   3600    A    1.2.3.4
web01.domain.com    0   3600    A    1.2.3.4

MX
domain.com  0   3600    MX   domain-com.mail.protection.outlook.com