Your site is going down because of server overload due to the emails being sent out again and again. Check to see if there is a cron job sending out emails and check to see what email accounts you have set up whether you created those email accounts or not.
If you see any cron job and you didn't set one up in your cPanel remove it. Also change the passwords of any email accounts you have created. If you see email accounts you did not create remove them.
If you are using an email client such as Mozialla Thunderbird make sure they are (POP) and not (IMAP), IMAP keeps processes running until you close your email client. If you have a few or even a couple email accounts opened it will screw you over.
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