Microsoft KB Archive/200389

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XIMS: How To Limit the Number of Recipients in a Message

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Q200389

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The information in this article applies to:


 * Microsoft Exchange Server, version 5.5

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IMPORTANT: This article contains information about editing the registry. Before you edit the registry, make sure you understand how to restore it if a problem occurs. For information about how to do this, view the "Restoring the Registry" Help topic in Regedit.exe or the "Restoring a Registry Key" Help topic in Regedt32.exe.

SUMMARY
This article explain how to limit the the number of recipients of a message processed by the Internet Mail Service using a registry entry.

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

For information about how to edit the registry, view the "Changing Keys And Values" Help topic in Registry Editor (Regedit.exe) or the "Add and Delete Information in the Registry" and "Edit Registry Data" Help topics in Regedt32.exe. Note that you should back up the registry before you edit it. If you are running Windows NT, you should also update your Emergency Repair Disk (ERD).

Start Registry Editor (Regedt32.exe) and locate the following registry subkey in the HKEY_LOCAL_MACHINE subtree: 

"System\CurrentControlSet\Services\Msexchangeimc\Parameters\MaxRecipients" Example:

"MaxRecipientsREG_DWORD: 0X30 (Decimal 48)" If the MaxRecipients value is set, for example, to 0x30, this translates to a decimal value of 48 which is the maximum number of recipients that the Internet Mail Service will process in an initial transmission.

This registry entry will function is as follows:


 * 1) If a message is addressed to 100 users, the Internet Mail Service will open a connection and process the first 48 RCPT TO commands.
 * 2) Next, the DATA command is issued, followed by the message data, and the message is ended.
 * 3) The Internet Mail Service will start a second message, and process the next 48 recipients and the same message data again.
 * 4) Finally, the remaining four recipients will be processed in a final e-mail.

Additional query words: IMS recipients

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Issue type : kbhowto

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