I have a simple user question. Whenever I add a user to my
linux box, it automatically creates a POP account, telnet account and
FTP account. HOW can I disable POP3 logins from this user? Any ideas?

We used ipop3d service, does it have any configuration to disable a
particular user from using pop3 service of the server?

The command that I am using to add new users is
adduser

Any info is greatly appreciated. Thanks!