I need help on webmail. Currently i am running on cpanel which allow user to log in through http://domain/webmail . Possible for me to create own squirrel mail interface? Did i need to buy extra license for that? How can i make it when user type http://domain/mail, it will link to squirrel interface and user log in through squirrel mail?
Yes it's possible and has been done in the past but will require some modifying of the squirrelmail code in order to have it login with $domain:143 rather than localhost:143 if you plan on using it with one install for multiple servers.
There are no licensing fees involved you just may need to find a coder to make those changes for you.