Syntax: /nickserv SET HIDE (EMAIL | USERMASK | QUIT) (ON | OFF)

Allows you to prevent certain pieces of information from being displayed when someone does a NickServ INFO on your nick. You can hide your E-mail address (EMAIL), last seen user@host mask (USERMASK), and last quit message (QUIT). The second parameter specifies whether the information should be displayed (OFF) or hidden (ON).