To change Maximum emails perhour for a domain

1) Check [root@server ~]#vi /var/cpanel/maxemailsperhour to increase the value

2)[root@server ~]# vi /var/cpanel/maxemails
# If you update this file you must run /scripts/build_maxemails_config
domain.com=500
site.net=1000

3) To check the change
[root@server ~]#cat /var/cpanel/maxemailsperdomain/domain.com
500