Open the Configuration → Definitions → Address Groups section to create IP group Email Access that will be used to limit access to email accounts (refer to chapter 2.15 Enabling access to local services from the Internet). This group will consist of the 123.23.32.123
and 50.60.70.80
IP addresses and of the entire 195.95.95.128
network with the 255.255.255.248
network mask.
Definition of the first group requires name of the new group, later additions allow selection of an existing group.
Likely, go to Configuration → Definition → Time Ranges to create a time interval that will be limited to accessing Internet services during the labor hours (from Monday to Friday from 8 A.M. to 4:30 P.M., Saturdays and Sundays from 8 A.M. to 12 A.M.).
You can use predefined day groups (Weekday or Weekend) to define the Valid on entry — it is not necessary to tick each day individually.