Symantec Mail Security, Administration Manual

Page: 111 / 258

111 Configuring email filtering
Managing policy resources
Add Attachment List page. For the last three choices, all characters are
interpreted literally; wildcards are not allowed.
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
True file type or True file class . Then click on the classes or
Table 4-15 Attachment characteristics for attachment lists
Characteristic Description Examples
True file type Specifies an attachment type based on direct
inspection of the type of file. You can use 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. Microsoft Word for Windows
True file class Specifies an attachment type based on the class of
file. You can use this to match files whose extensions
may not match their true file classes. Word Processor Document
File name Part or all of a file. A partial match for a file will
match a file, such as “oxy” for “oxygen.txt”. oxy
oxygen
oxygen.txt
Extension A period followed by usually three letters at the end
of a file that, by convention, indicates the type of the
file. .txt
.exe
.text
.zip
MIME-type The MIME type of the attachment in the email
message. MIME is a standard for email attachments. text/plain
image/gif
application/msword
application/octet-stream