Create and modify user accounts using the vadduser command.
This interactive utility will guide you step-by-step through the user account
FTP and e-mail services are
added to each user account by default. If you want the user account to have
both FTP and e-mail privileges, just hit the "Enter" key when asked to accept
For the user account to have FTP privileges only, deselect the
e-mail privileges by entering "mail". For the user account to have e-mail
privileges only, deselect the FTP prvileges by entering "ftp". If you
need to add a service not currently in the list enclosed by the
square brackets ("[ ]"), then type name of the service ("mail" or "ftp") and hit the
FTP service must be enabled if user account e-mail will be accessed via IMAP.