is there any way to delete mails from server in a mail account

i have a problem, there are 1200 mails in my catchall account but whenever i try to retrieve them my mail client stops at mail no 1078. now problem is these mail are of not my use now is there any way i can delete them via ssh, telnet or ftp.

plz incase of telnet or ssh list commands

 

 

 

 

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