DOCUMENT:Q256856 16-APR-2000 [exchange] TITLE :XIMS: "550 Relaying Is Prohibited" Error Returned for Messages PRODUCT :Microsoft Exchange PROD/VER:winnt:5.5 SP3 OPER/SYS: KEYWORDS:kbenv kberrmsg ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft Exchange Server, version 5.5 SP3 ------------------------------------------------------------------------------- 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: Q196626 Q193922 Additional query words: ims gal ====================================================================== Keywords : kbenv kberrmsg Technology : kbExchangeSearch kbZNotKeyword2 kbExchange550SP3 Version : winnt:5.5 SP3 Issue type : kbprb ============================================================================= THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY. Copyright Microsoft Corporation 2000.