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How to block attachment file name extensions in an Exchange environment with the Outlook Security Administrator Package
If you have an Exchange environment that uses the Outlook Security Administrator Package and you want to add more attachment file name extensions that you want to block in your Outlook configuration, you can add more attachment file name extensions to the Level 1 file list. To do this, follow these steps:
Start Outlook with an account that has permissions to change the Outlook Security Form in the Outlook 10 Security Settings public folder.
In the folder list pane, locate the version-specific Outlook Security Settings public folder.
Note For Microsoft Outlook 2000, the name of the public folder is Outlook Security Settings. For Microsoft Outlook 2002 and Microsoft Office Outlook 2003, the name of the public folder is Outlook 10 Security Settings.
Double-click Default Security Form.
Under Miscellaneous Attachment Settings, click to clear the Show level 1 attachments check box.
Under Level 1 File Extensions, type the attachment file name extensions that you want to block in the Add box.
If you want to add more attachment file name extensions in the Add box, you can separate them with a semicolon. For example, if you want to block both the .zip and the .gif attachment file name extensions, type .zip; .gif
Click Close, and then click Yes to save your changes.
Repeat these steps for each Outlook Security Form that you have in the public folder for each security group that you want to add more attachment file name extensions to.
The next time that your users start Outlook, the new settings will be applied.
Note If you the Show Level 1 File Attachments check box from step 4 was already selected to allow all Level 1 attachment file name extensions types to appear in the e-mail message as an attachment, you must add the attachment file name extensions that you do not want to appear in the e-mail message as an attachment by following this one additional step:
Under Level 1 File Extensions, locate the Remove box. In the Remove box, type the attachment file name extensions that you do not want to appear in the e-mail message as an attachment.
If you want to add more attachment file name extensions in the Add box, you can separate them with a semicolon. For example, if you want to block both the .zip and the .gif attachment file name extensions, type .zip; .gif