To define a filter type for email attachments. After the filter type is set, some email attachments with threat behaviors can be filtered, thus keeping the information of recipients secure. See the figure below.

Click Add to create a filter type for email attachments, as shown in the following figure.

Name: Specify the name of the file type.

Description: Specify the description of the attachments.

File Extension: Enter the suffixes of files in the text box, such as "*.mp3" or "mp3".