Symantec 10744983 Administration Guide - Page 125

Configuring email filtering 125 Managing policy resources Table 4-13 Attachment characteristics for attachment lists Characteristic Description Examples True file type Specifies an attachment type based on direct Microsoft Word for inspection of the type of file. You can use Windows this to match files whose extensions may not accurately reflect their true file types. Each file type is a member of a specific file class. True file class Specifies an attachment type based on the Word Processor class of file. You can use this to match files Document whose extensions may not match their true file classes. File name Part or all of a filename. A partial match for oxy a file will match a file, such as "oxy" for "oxygen.txt". oxygen oxygen.txt Extension A period followed by usually three letters at .txt the end of a file that, by convention, .exe indicates the type of the file. .text .zip MIME-type The MIME type of the attachment in the text/plain email message. MIME is a standard for email image/gif attachments. application/msword application/octet-stream For a technical description of MIME, see the following RFC: http://www.ietf.org/rfc/rfc2045.txt To add an attachment list 1 In the Control Center, click Policies > Attachment Lists. 2 Click Add. 3 In the Attachment list name box, type a name for the attachment list.This is the name that appears on the Attachment Lists page and as the Attachment List in the Conditions section when configuring a policy. 4 In the Configure Attachment Types box, either: ■ Click the first radio button to match files based on the actual type or class of the file, even if that type or class does not match the extension. Choose