Provided by: qmail_1.06-6.2~deb10u1build0.16.04.1_amd64 

NAME
qbiff - announce new mail the moment it arrives
SYNOPSIS
in .qmail: |qbiff
DESCRIPTION
qbiff writes a message to your screen whenever a new mail message is delivered, if you ran biff y after
logging in.
WARNING: If you create a .qmail file to enable qbiff, make sure to also add a line specifying delivery to
your normal mailbox. For example:
/home/joe/Mailbox
|qbiff
SEE ALSO
biff(1), dot-qmail(5)
qbiff(1)