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Defining Email Policies > Content Filter tab > Attachments > Quarantining messages with specific file types
Quarantining messages with specific file types
 
Related topics:
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Masking attachments
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Attachment exceptions
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Parking attachments
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Image analysis and quarantining
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Creating custom file types
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Message Size
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Filtering using lexical rules
You can quarantine messages containing attachments matching file types that you specify.
File types are grouped together into file formats. For example, if you select the Sound format, this quarantines anything related to sound files, including RealAudio, Windows Media Audio, MPEG Audio, and MIDI files.
You can expand a file format to select or remove specific file types from the quarantine list. For example, you can select the Standard Graphics format to block all standard image attachments, but then choose to clear the JPEG file type within that format to allow JPEGs to be delivered.
If the available file types do not meet your requirements, you can set up custom file types containing one or more file extensions and MIME types. For more information, see Creating custom file types. The custom file types you create are available for all policies, and appear as part of a default custom file format on the same page as the supplied file formats.
 
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Note 
Options on the Antivirus tab are the most effective way to block unsafe executables. For more information, see Executables.
To quarantine attachments:
1.
On the Content Filter tab, click the link in Quarantine messages containing files with these types.
The page displays the file formats and types currently being quarantined.
2.
Click Edit.
3.
Check the boxes for file formats you wish to quarantine.
4.
To select particular file types within a file format, click the + icon to expand the format.
If you have selected the file format, all of the subsidiary file types are also selected. You can select or clear as many file type options as you wish. The information next to each file format tells you how many are currently selected from that format.
5.
Click Submit.
Inverting the quarantine action
Inverting the quarantine action enables you to specify that all file types except those selected are quarantined. If you want to do this, select that do not match the selected file types from the drop-down list.

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Defining Email Policies > Content Filter tab > Attachments > Quarantining messages with specific file types
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