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In an Exchange Server 2007 Service Pack 1 (SP1) environment, when a user sends an e-mail message to an X.400 address that uses the slash field separator (/) instead of a semicolon (;), the message is not delivered and a non-delivery report (NDR) that resembles the following is generated:
Note This issue does not occur in Exchange Server 2003.
Before Update Rollup 9, Exchange Server 2007 SP1 did not support the slash character as a valid field separator of an X.400 address.
To resolve this problem, install Update Rollup 9 for Exchange 2007 Service Pack 1. For more information about Update Rollup 9 for Exchange Server 2007 Service Pack 1, see the following Exchange Help topic: