RETURNED BY CQ WW: Delivery failed

[Contest Robot <unreplyable@kkn.net>]

(This is an automatic reply.)
 
Your message to cw@cqww.com could not be processed because the
Subject: of the message
    
        Delivery failed

is not a valid callsign.  Please resubmit your log with an email 
Subject: header that looks like this
 
        Subject: your-callsign
 
If you are submitting a log for a special callsign (such as a 1x1 call
like N6O), or if you are unsure why you were sent this error message
please contact me at cw-questions@cqww.com to make alternate arrangements.
 
Thanks for your cooperation.  73.
 
Bob, K3EST
CQ WW Director