We recommend users send no more than 50 emails per day. If you greatly exceed this value the system automatically throttles you to 24 emails per day (1 per hour) because it suspects you of sending spam. The usual cause of getting throttled on emails for legitimate websites is not having a strict enough bot prevention system on new account creation. If thousands of spam bots are allowed to create accounts on your website then of course thousands of emails will be sent. Most users find that our suggested number of emails is more than enough once they solve their bot problem. I have no idea if that is the issue with your site, but it's something to keep in mind. I can reset the throttle to the default values for you, but if you continue to send such a massive amount of emails you will just end up throttled again. Would you like a reset?