[Exim] How do I delete frozen messages?

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M++++\kend
|||||MOllie Cook
||||MJohn Burnham
|||MTheo E. Schlossnagle
|||MDave C.
||MJohn W Baxter
|MSuresh Ramasubramanian
M\Odhiambo Washington
|MNils Ketelsen
|MPeter Radcliffe
|MOdhiambo Washington
MPhilip Hazel