[exim] how to delete "dead" emails

Hi,

How can I delete the following emails from Exim:

004-10-19 18:16:25 Start queue run: pid=62177
2004-10-19 18:16:25 1CIttp-000EP5-R3 == root@??? routing 
defer (-51): retry time not reached
2004-10-19 18:16:25 1CIsoQ-000GMv-7d Message is frozen
2004-10-19 18:16:25 1CHRxR-0004nr-Ks Message is frozen
2004-10-19 18:16:25 1CHRxQ-0004mN-Th Message is frozen
2004-10-19 18:16:25 1CJcq3-0007Vx-7D == root@??? routing 
defer (-51): retry time not reached
2004-10-19 18:16:25 1CIrWq-000GcS-Rv Message is frozen
2004-10-19 18:16:25 1CI3CM-0007yR-Pl Message is frozen
2004-10-19 18:16:25 1CI39w-0007xO-KC Message is frozen
2004-10-19 18:16:25 1CJFOG-0003re-ES Message is frozen
2004-10-19 18:16:25 1CI1jZ-0007hI-Ia Message is frozen
2004-10-19 18:16:25 1CIr9m-000GHS-95 Message is frozen
2004-10-19 18:16:25 1CJcq2-0007Uc-51 == root@??? routing 
defer (-51): retry time not reached
2004-10-19 18:16:25 1CJGMr-000HIX-9Y Message is frozen
2004-10-19 18:16:25 1CJcq2-0007Vk-Vh == root@??? routing 
defer (-51): retry time not reached             
2004-10-19 18:16:25 1CJcq3-0007Vw-4b == root@??? routing 
defer (-51): retry time not reached

Thanks
Sam