Where can I manage Email-sending limits?
The default email limits are set through the "WHM / Tweak Settings" interface under the "Mail" section. While account-based limits are managed through the "Modify Account" interface using "Hourly Email by Domain Relayed configuration".
It is also possible to change limits per domain, but this requires manual editing of cPanel user files. You can find full details regarding email limits in our documentation:
The documentation details setting the default global sending limits as well as setting limits per account and domain.