AT&T Unix Owner's Manual page 280

Updating the UNIX PC
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Transmission days:
This field determines the days of the week your system
can transmit mail to the other system.
The standard options are All Days, Work Days (Monday
through Friday), Weekends (Saturday, Sunday), and
Never. Use the Never option if you want only to
receive mail, not send it.
You can also create your own special combination of
transmit days:
4-44
l
Press <Creat>.
A warning message appears to make sure you
want to create a special group of
transmission days.