The mail spool has more then 1000 messages!

I think there is someone uses my server for spamming since there are more than 1000 messages in queue.

but I cannot find the email of the spammer therein.

All messages in queue are from nobody!
From: Nobody <nobody@hostname.com>

Is there anyway to detect who is spamming?
I use cpanel+exim

Thanks

 

 

 

 

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