You can change the most of e-mails permitted for a specific domain to a different limit than the system default by using the following back end file.
/var/cpanel/maxemails
Just add the entries as follows:
MAX_EMAIL_PER_HOUR=# MAX_EMAIL_PER_HOUR-domain.com=#
You just make sure to replace domain.com with your domain name. The first MAX_EMAILS_PER_HOUR entry would cover the entire account, while the second would only cover the domain noted.
Don’t forget to execute the following script after updating:
/scripts/build_maxemails_config
That’s it…