Cron Job on Hostgator

I have one e-mail account where I want to delete messages older than 60 days on a nightly basis. I'm using cPanel with Hostgator. I've done some reading - but archivemail is not available (from what I can tell) as an operation I can run. Can someone suggest a command I should run in Cron Job to clear out old e-mails on a nightly basis? Thanks in advance!