Filtering Incoming X.400 Mail By Originator Name

You can reject incoming X.400 mail based on the contents of the originator name in the P1 message header. You can specify which message to reject by listing particular originator name components. You can return a non-delivery receipt (NDR) to the originator of the rejected message. An event is logged for each rejected message.

For example, you can reject all messages from specified countries by filtering on the country component of the originator name, or you can reject all messages from a particular company by filtering on the organization component.

Message filtering is defined for each connector using a registry key on the Microsoft Exchange Server computer where the connector is installed. A second registry key specifies if an NDR is returned for rejected messages.

To reject messages by originator name

1. Create the following REG_MULTI_SZ registry key and substitute the display name of the connector in all upper case letters for <CONNECTOR NAME>.

   HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services MSExchangeMTA\Parameters\<CONNECTOR NAME>\Bar P1 Originator

2. Set the value of the key to the originator name components of messages you want to reject. You can use any of the X.400 name components except ou2, ou3, and ou4. To specify multiple originators, add separate values within the REG_MULTI_SZ key. For example, to reject all messages from an originator with an organization name of MSFT, set the registry key value to o=MSFT. To reject all messages from originators in the United States and Great Britain, set the registry key to two values, c=US and c=GB.
3. To return an NDR to the originator of rejected messages, create the following DWORD registry key, substitute the display name of the connector in all upper case letters for <CONNECTOR NAME>, and set its value to 1.

   HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services MSExchangeMTA\Parameters\<CONNECTOR NAME>\NDR to barred originator

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