WatchGuard Firebox System 7.0 User Guide

Chapter 9: Configuring Proxied Services4 To create a new MIME type, click New Type. Enter theMIME type and description. Click OK.The new type appears at the bottom of the Content Types dropdownlist. Repeat this process for each content type. For a list ofMIME content types, see the Reference Guide.You can use wildcard characters as follows:To allow content typesAn asterisk (*) matches any string, including anempty string.To deny file name patterns:An asterisk (*) matches any string, including anempty string.A question mark (?) matches any single character.Denying attachments based on file name patternsThe Content Types tab includes a list of file-name patternsdenied by the Firebox if they appear in email attachments.To add a file-name pattern to the list, enter a new pattern inthe text box to the left of the Add button. Click Add.Note that denying a particular attachment does not automaticallytrigger protocol anomaly detection (PAD) rules.You must specifically add the content type to the PADrules, as described in “Configuring the Incoming SMTPProxy” on page 138.Specifying a deny messageIn the Content Types tab, you can enter a message to beshown when a content type is denied–this message isshown to the recipient only and not the sender. A defaultmessage is provided. Use the variable %t to add the contenttype to the message. Use the variable %f to add the filename pattern to the message.142 WatchGuard Firebox System