Google Message Security for Google Apps Administration Guide - Manual (Page 282)

282 Message Security for Google Apps Administration Guide
Productivity Filters check for office documents such as Microsoft Word or Excel, or
media files such as images and sound files.
1. Click a link (for example, Executables or Compressed Files) to see the file
types are included in each filter.
WARNING: To filter just a few file types, don’t use System Threats or
Productivity filters (leave them on Ignore.) Instead, enter specific file
extensions in the Custom File Types filter.
2. Choose how to process messages containing the file types: Bounce, User
Quarantine (Inbound only), Quarantine Redirect, Approve, or BCC-
Quarantine (Ignore provides no filtering). See “Attachment Filter Dispositions”
on page 278.
Unlike Custom File Types, System Threats and Productivity file types are not
verified against MIME type, but are filtered based on the file-extension name
only.
Troubleshoot Attachment Manager
Here are answers to common questions. If you have more questions, contact
support for more information.
What if I don’t want messages from certain senders to be filtered?
You can allow Approved Senders for an organization to bypass Attachment
Manager filters by clicking the Approved Senders check box on the Attachment
Manager configuration page. See “Configure Attachment Manager” on page 275
for more information.
How do you block just one type of file, like an MP3 file or .exe file?
Add the file extension to the Custom File Types filter as described in “Custom File
Types Filter” on page 281.