You cannot host applications that send massive email campaigns or generate excessive amounts of mail. Doing so can cause you to overuse your hosting resources, and will not function as intended.
Here are some common causes of overusing hosting resources regarding excessive email:
You can try to correct resource usage caused by excessive email by following any and all of these steps:
If you are still experiencing issues with resource usage, review your hosting for other possible causes at Common causes for resource overusage (Linux).
You will want to make sure that you are correcting the underlying cause to any resource issue. Simply removing Websites and/or files without correcting the underlying issue can cause the problem to recur.