from - who is my mail from?
from [-s sender] [user]
from prints the mail header lines in your mailbox file to show who
sent you mail. If user is specified, user's mailbox is examined
instead of your own. If the -s option is given, only headers of mail
from sender are printed.
List header lines for all current mail in your mailbox that was sent
from -s ken
from was developed by the University of California, Berkeley.
biff(1), mail(1), prmail(1).
Hewlett-Packard Company - 1 - HP-UX Release 11i: November 2000