XADM: Primary SMTP Proxy Not Used for E-mail Address

If the primary SMTP proxy is not used for the original e-mail address, the subsequent outbound message uses the second primary proxy address.

To avoid the problem, always regenerate (use partial fidelity) the headers with addresses for outbound messages if P2 proxy lookups are being done. If this value is set, then on outbound messages, all address headers are regenerated with the primary proxy. All addresses will be regenerated if these flags are set.

WARNING: Using Registry Editor incorrectly can cause serious problems that may require you to reinstall Windows NT. Microsoft cannot guarantee that problems resulting from the incorrect use of Registry Editor can be solved. Use Registry Editor at your own risk.

To resolve the problem, do the following:

1. Install Service Pack 1 for Microsoft Exchange Server version 5.0.
2. Start Registry Editor (Regedt32.exe).
3. Go to the following key in the registry:

         HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\ 
         MSExchangeIMC\Parameters
   						

4. On the Edit menu, click Add Value and use the following entry:

         Value Name: AddressRewrite
         Data Type:  REG_DWORD
         Value:      1
   						

5. Locate the Resolve2 value name. Double-click it and change the value to 1. It should resemble the following:

         Value Name: ResolveP2
         Data Type:  REG_DWORD
         Value:      1
   						

When both ResolveP2 and AddressRewrite are set in the IMS registry, Microsoft Exchange Server will look up the SMTP proxies and remap the inbound SMTP proxy to the corresponding primary SMTP proxy.

Microsoft has confirmed this to be a problem in Microsoft Exchange Server version 5.0. This problem was corrected in the latest Microsoft Exchange Server 5.0 U.S. Service Pack. For information on obtaining the service pack, query on the following word in the Microsoft Knowledge Base (without the spaces):