Message SAP XS637 - Currently no delivery to &, as recipient cannot be reached

Diagnosis
The message could not be delivered to recipient &V1&. A temporary error(such as the hard drive being full) has occurred in the processing ofthe communication system.

System Response
Processing was completed normally.
Additional information of the used node (if available, in the systemlanguage of the node):
V4

Procedure
Attempt to resend the message at a later time.