mailalias[options]names
Display the e-mail addresses associated with one or more alias names.
mailalias displays addresses that are listed in the files 
/var/mail/name, $HOME/lib/names, and in the files pointed to
by the list in /etc/mail/namefiles.  
mailalias is called by mail.
Suppress name; show only corresponding mail address.
Verbose mode; show debugging information.