Microsoft KB Archive/256856

= XIMS: "550 Relaying Is Prohibited" Error Message Returned for All Messages =

Article ID: 256856

Article Last Modified on 10/28/2006

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APPLIES TO


 * Microsoft Exchange Server 5.5 Service Pack 3

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This article was previously published under Q256856



SYMPTOMS
When you enable the Do Not Reroute Incoming SMTP mail option on the Routing tab in Internet Mail Service (IMS) and your previously configured routing restrictions are still in place, a "550 Relaying is prohibited" error message may be displayed for all incoming e-mail messages. This behavior occurs even though the message recipient is found in the Exchange Server global address list.



CAUSE
This behavior occurs when you enable the "Do Not Reroute Incoming SMTP mail" option. This option is an old setting from Microsoft Exchange Server 4.0. When this feature is active, e-mail messages are not routed because e-mail messages are not delivered.



WORKAROUND
If you want to restrict Internet Mail Service from being used as a relay and make sure the "550 relay prohibited" error message is displayed, use the following steps:
 * 1) Enable the Reroute Incoming SMTP Mail option.
 * 2) Click Routing Restrictions.
 * 3) Click to select the Hosts and clients with these IP addresses check box, and then click OK.
 * 4) Stop and restart Internet Mail Service.



MORE INFORMATION
For additional information about routing restrictions, click the article numbers below to view the articles in the Microsoft Knowledge Base:

196626

193922

Additional query words: ims gal

Keywords: kbenv kberrmsg kbprb KB256856

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