[Exim] immidiate queue purging

hello everyone. yestarday night, one of our client have been
installed 'microsoft exchange server' as maile daemon...without relay
control (mindless) :-E~~~~, so spammers quickly identify it and send lot of
spam via open relay. on this servers as a 'backup smarthost' was set
my servers with exim 4.22. so a lot of mail now in queue wainting for
delivery. is any choose to delete all ot grepped message from queue?

vlad.