removing mail queue

I want to delete my mail queue. One of my users has tons of mail in /var/spool/exim/input. The files look like 1ACgXd-0003jo-6W-H.

They all follow some numbering sequence.

My question is how do I remove all of these files? I use the rm command, but it returns "bash: /bin/rm: Argument list too long"

Can anyone help?

 

 

 

 

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