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FROM(1) General Commands Manual FROM(1)

from
print names of those who have sent mail

from [-f file] [-s sender] [user]

from prints out the mail header lines from the invoker's mailbox.

The options are as follows:

file
The supplied file is examined instead of the invoker's mailbox. If the -f option is used, the user argument should not be used.
sender
Only mail from addresses containing the supplied string are printed.

If user is given, the user's mailbox, is examined instead of the invoker's own mailbox. (Privileges are required.)

/var/mail/*
 

biff(1), mail(1)

The from command appeared in 2BSD.

Bill Joy, 1979.
January 15, 2012 OpenBSD-5.1