who

WHO  -  check a mail address

Usage:  WHO address

The WHO command shows where mail will go if you SEND to an address.
 	             --Response:--	--If:--
Read>who abc         abc                abc is a userid
Read>who abc         xyz		abc ROUTEd mail to xyz
Read>who consultant  dcl		consultant is a system alias
Read>who rich	     rich@comp.bfu.edu	rich is an alias you DEFINEd
Read>who ?           (list of aliases)	you DEFINEd one or more aliases

The response to WHO will sometimes be a list of names (try "who bug-mm").
If the address is not valid, the response is "... User unknown" and then
your own userid, since mail to that address would be returned to you.

The FINGER command gives information about users.

For more help, type "help" and one of these topics:
   finger   define   route   information