After setting up Basic Level Configuration, you can proceed to this configuration. This guide is consists of three steps of configurations for keyword search, Prevent large number of email sending and Prevent sending to private addresses as below:
1) Define Mail Groups
2) Define Rule Groups
3) Define Filters
For more detailed procedure of setting, please refer to this link:
Data Loss Prevention Settings
1) Define Mail Group
In the "Define Mail Group" interface, create "Private Addresses" Mail Group as below.
(In this case, Private Addresses are "@yahoo.com" and "@hotmail.com" domains.)
2) Define Rule Group
i) First, in the "Define Rule Group" interface, create two rules as below.
a) Search String and Delete
Credit Card Format:
b) Delete if there are more than 10 addresses
ii) Register "Search String and Delete Rule" group as below.
iii) Second, in the "Define Rule Group" interface, create a rule as below.
iv) Register "Delete All Messages" group as below.
3) Define Filter
i) Modify the priority of existing filter (120 -> 140) as below.
ii) In the "Define Filter" interface, create two filter as below.
a) Priority 120:
b) Priority 130:
iii) The setting complete.
Depending on your needs, consider introduction of next level security.
High Level Security Configuration