Groupwise error: Destination domain is not External

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Error syncing to Groupwise:
Connecting to GroupWise : 12/20/2010 10:03:06 AM
Groupwise                | Destination domain is not External.
Run Summary : 12/20/2010 10:03:06 AM
Run Time                 | 0 seconds
Error Summary : 12/20/2010 10:03:06 AM
Configuration Failure    | 1

Cause:

When syncing to Groupwise, you must to create an external domain and under that an external post office. SS should be configured to sync to this domain/post office.