Limit email/hour for just one domain on an account (addon, park, or sub domain).
Sometimes you have an email account and you want to edit the email/hour for only one of the domain on the account, here is how to do that.
SSH to the server
Edit the file
Add or Edit a line like this
domainHere.com with the domain name in question, and 100 with the number of emails per hour you wish to allow.
Save the file and run