Exchange email problem

65 pts.
Tags:
Microsoft Exchange 2007
Microsoft Exchange errors
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: 'grantm@profileglass.co.za' 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 grantm@profileglass.co.za isp.org.za #550 5.7.1 <grantm@profileglass.co.za>... Fix reverse DNS for 41.223.61.90,or use your ISP server ## Original message headers: Received: from virgo.aquariusum.co.za ([41.223.61.90]) by virgo.aquariusum.co.za ([41.223.61.90]) with mapi; Wed, 20 Aug 2008 11:07:56 +0200 From: "profileglass@worldonline.co.za" <profileglass@worldonline.co.za> To: "'grantm@profileglass.co.za'" <grantm@profileglass.co.za> Sender: Andrew Packman <andrewp@aquariusum.co.za> Date: Wed, 20 Aug 2008 11:07:54 +0200 Subject: Accepted: Golf Thread-Topic: Golf Thread-Index: AckCCHhWbekQpL5dQDKBjseyFRuO7gAADAgwACbN0FA= Message-ID: <D3349AA055E5EE4EBFBBA2CD23BFAB53010ED6CDE21F@virgo.aquariusum.co.za> Accept-Language: en-US, en-ZA Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: acceptlanguage: en-US, en-ZA Content-Type: multipart/alternative; boundary="_002_D3349AA055E5EE4EBFBBA2CD23BFAB53010ED6CDE21Fvirgoaquari_" MIME-Version: 1.0

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Sounds like your receiving connector is setup to do reverse DNS lookups. The text “<b>Fix reverse DNS for 41.223.61.90,or use your ISP server ##</b>” is the indicator of this. Not all organizations have setup reverse DNS and some e-mail systems do this to reduce spamming but as you see, it can also stop legitimate e-mails. To learn more about reverse DNS see this. To fix it take a look at these suggestions:

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