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In content filtering rules, you can specify the following scanning conditions to filter email messages with attachments. Deep Discovery Email Inspector matches an email message when all conditions are met.

Table 1.

Setting

Description

File type

Select this option to filter email messages based on the matching option and file types:

  • Matching option:

    • Selected attachment types: Deep Discovery Email Inspector takes action on messages with attachments of the selected file types.

    • Not the selected attachment types: Deep Discovery Email Inspector takes action on messages with attachments that are not of the selected file types.

  • File types:

    • True file types

    • Custom file extensions

    • Password-protected archive files

    Note:

    Do not include wildcards in a custom file extension.

File name

Select this option to filter email messages based on file names.

Type a file name and press Enter. You can specify more than one file name in the text field.

Note:

Do not include wildcards in a file name.

Attachment size

Select this option and configure the following settings to filter email messages based on the attachment size:

  • Select a comparison symbol

  • Type a number to represent the attachment size

  • Select a unit (KB or MB)

Number of attachments

Select this option and configure the following settings to filter email messages based on the number of attachments detected:

  • Select a comparison symbol

  • Type a number to represent the number of attachments
Parent topic: Configuring a Content Filtering Rule