XCON: Cannot Send to DL if Sender Does not have X.400 Address

SUMMARY

When you attempt send a message to a Microsoft Exchange Distribution List (DL), you might receive the following error: This error will occur if you do not have an X.400 address. To add an X.400 address, the Microsoft Exchange administrator will need to follow these steps:

1. Start the Microsoft Exchange Administrator program.
2. Select the sender's mailbox.
3. Open the File menu, click Properties, click E-mail Addresses, click New, click X.400 Address, and add the X.400 address.