How to enable port 26 for SMTP on the server

Please refer the following steps :

1. Login to server WHM. Go to Main >> Service Configuration >> Service Manager
2. At the botom add the number 26 at "exim on another port"
3. In /etc/apf/conf.apf add the port 26 at this line "EG_TCP_CPORTS"
4. apf –r