[EXIM] Un-unlockable queue

I got this message when trying to run exim -qf ...
The server www is ok and i can telnet to its port 25 and send messages
how to unlock ?

1999-05-03 14:57:46 10eG41-0008Q4-00 == intrel@www.***.***.it
R=lookuphost defer (-1): host lookup did not complete


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