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550 5.7.1 Unable to relay

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550 5.7.1 Unable to relay - 18.Mar.2008 11:54:02 AM

hdamis

Posts: 72
Joined: 16.Mar.2005
From: Jordan
Status: offline

I have an application which send emails to external via our smtp and did a recive connector it sends only to emails to our smtp but to external as yahoo or hotmail it give the follwing error .
Sorry but the following error ocuured The server rejected one or more recipient addresses. The server response was: 550 5.7.1 Unable to relay , please refer to you administrator for more information.
I am using exchange 2007 sp1

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RE: 550 5.7.1 Unable to relay - 18.Mar.2008 1:59:58 PM

Elan Shudnow

Posts: 319
Joined: 4.Jan.2007
From: Chicago, IL
Status: offline

http://msexchangeteam.com/archive/2006/12/28/432013.aspx

I would do option 2 to grant relaying.

One thing to keep in mind, is you would need 2 IP Address. This is unless you specify a remote server IP Address on the relay connector. When the Hub Transport receives a relay attempt from a server, if it notices there is a connector with an explicitly defined ip address instead of 0.0.0.0-255.255.255.255, it will use that connector which has the relay enabled negating the need for a second IP Address for relaying.

Make sure you follow all those steps including doing the Add-ADPermission for the connector to allow the anonymous logon group to relay using that connector.

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Elan Shudnow
http://www.shudnow.net

(in reply to hdamis)

Post #: 2

RE: 550 5.7.1 Unable to relay - 18.Mar.2008 2:58:25 PM