i am enable to send mail sap user
when i check SOST,
Error comes
Message no. XS637
Diagnosis
The message could not be delivered to recipient . A temporary error (such as the hard drive being full) has occurred in the processing of the communication system.
System response
Processing was completed normally.
Additional information of the used node (if available, in the system language of the node):
451 http://www.spamhaus.org/query/bl?ip=203.90.68.
Procedure
Attempt to resend the message at a later time