Hi, one of our clients is unable to send us emails, he can receive the mails we send him, but when he replies, it comes back with the below error. Could anyone possibly tell me what and where the problem is?
Delivery has failed to these recipients or distribution lists:
Your message wasn't delivered because of security policies. Microsoft Exchange will not try to redeliver this message for you. Please provide the following diagnostic text to your system administrator.
The following organization rejected your message: isp.org.za.
Sent by Microsoft Exchange Server 2007
Diagnostic information for administrators:
Generating server: virgo.aquariusum.co.za
isp.org.za #550 5.7.1 <firstname.lastname@example.org>... Fix reverse DNS for 18.104.22.168,or use your ISP server ##
Original message headers:
Received: from virgo.aquariusum.co.za ([22.214.171.124]) by
virgo.aquariusum.co.za ([126.96.36.199]) with mapi; Wed, 20 Aug 2008 11:07:56
From: "email@example.com" <firstname.lastname@example.org>
To: "'email@example.com'" <firstname.lastname@example.org>
Sender: Andrew Packman <email@example.com>
Date: Wed, 20 Aug 2008 11:07:54 +0200
Subject: Accepted: Golf
Accept-Language: en-US, en-ZA
acceptlanguage: en-US, en-ZA
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