Which (for admins)
The which command allows an administrator to determine which mailing lists a particular person belongs to. The syntax of the which command is:
You can specify as many email addresses on the which command line as you like. For example, the follow commands are valid:
which firstname.lastname@example.org The which command is only available to administrators. You must issue a "login" command before using the send command. For more information about login, see Login.
which email@example.com firstname.lastname@example.org
Note that if you do not first login as an administrator, the which command will tell you which lists you are on. See Determine Membership Settings.