[exim] Exim can't delete queue

Ubuntu 8.04
Exim 4

I have 10 frozen messages in the queue and I can't delete them. Both of
these commands:

sudo exim -bpr | grep frozen | awk '{print $3}' | xargs exim -Mrm

sudo exim4 -bp | awk '/^ *[0-9]+[mhd]/{print "exim -Mrm " $3}' | sh

return Permission Denied. Also I know that only the sender of the mail can
delete it so I tried it without sudo, still denied.

I got these commands from two different places, does it matter if I use exim
or exim4?
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