Your organization might want to prohibit users from receiving the email messages that contain multimedia file attachments, such as music and video files. When you enable the Multimedia File Rule, Mail Security detects the supported file extensions and types and takes the actions that you specify. Mail Security can determine if a file is a true multimedia file by analyzing the file contents, rather than looking at the file name extension. Blocking multimedia file attachments not only helps your organization enforce content policies, it also conserves scanning and file storage resources.
Note: | Mail Security can determine the true file type of a well-formed binary file. The true file type of a binary file variant cannot always be accurately determined. |
Table: Supported multimedia file types lists the multimedia file types that Mail Security supports (this list cannot be modified).
Table: Supported multimedia file types
To configure multimedia file detection
In the console on the primary navigation bar, click Policies.
In the sidebar under Content Enforcement, click File Filtering Rules.
In the content area, in the File Filtering Rules table, click Multimedia File Rule.
In the content area, in the File Filtering Rules table, on the Multimedia File Rule row, click the box under the Status column, and then use the drop-down menu to select Enabled.
This rule is disabled by default.
In the preview pane, in the Action to take list, use the drop-down menu to select one of the following to specify the action to take when a multimedia file is detected:
Delete entire message
Delete attachment/message body and replace with text
Quarantine entire message and replace with text
Quarantine attachment/message body and replace with text
Log only
The default setting is: Quarantine entire message and replace with text.
In the Replacement text box, type your customized message if you want to replace the message or the attachment body with a text message.
The default text is: Symantec Mail Security replaced %attachment% with this text message. The original file contained %violation% and was %action%.
Check one or more of the following to send email notifications about the detection:
Notify administrators
Click the down arrow and then type your customized text in the Subject line box and the Message body box.
The default subject line and message body text is as follows:
Notify internal sender
Click the down arrow and then type your customized text in the Subject line box and the Message body box.
The default subject line and message body text is as follows:
Notify external sender
Click the down arrow and then type your customized text in the Subject line box and the Message body box.
The default subject line and message body text is as follows:
On the toolbar, click Deploy changes to apply your changes.