Hope, you are using a cPanel/Whm server. If so
1.Log into WHM
2. Go to Main >> Server Configuration >> Tweak Settings
3. you can see an option like this
"The maximum each domain can send out per hour"
Set it to the number you want.
If you set it to 0, it is unlimited .
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You will need to SSH into your server and edit the file /var/cpanel/maxemails (which won't exist) and add domain=number pairs for those that you want to restrict (or increase) to a particular number of emails per hour, e.g:
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