Sidewinder G2 6.1.2 Administration Guide - Glossary of Technical ...

Chapter 6: Configuring Application Defenses
Creating Mail (Sendmail) Application Defenses
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1 Configure the appropriate MIME/Virus/Spyware filter rules in the MIME/
Virus/Spyware Filter Rules table, as follows:
• Create a new filter rule—To create a new filter rule, click New and see
“Configuring MIME filtering rules” on page 166.
• Modify an existing filter rule—To modify an existing filter rule, select the
rule you want to modify, and click Modify. See “Configuring MIME
filtering rules” on page 166. (If you are modifying the default MIME
filtering rule, see “Configuring the Default filtering rule action” on page
168.)
• Delete a filter rule—To delete an existing filter rule, select the rule you
want to delete and click Delete. You will be prompted to confirm your
decision.
2 Determine how infected files will be handled by selecting one of the
following options:
• Discard Infected Files—Select this option to discard infected files.
• Repair Infected Files—Select this option to remove the virus from the
file and then continue processing the file.
3 To reject all files in the event that scanning is not available, select the
Reject All Files If Scanning Is Unavailable check box. If you select this
option, files will either be discarded or returned to sender as specified by
the Rejected Mail Handling option selected on the Mail (Sendmail) Control
tab.
4 In the Scan File Size Limit (KB), specify the maximum file size that will be
allowed (in KB). If a file exceeds the size specified in this field, scanning will
not take place and the file will be denied.
5 Select Full Scan of Entire Mail Message if you want to perform scanning on
the entire mail message (that is, the message with all of its MIME types is
scanned as a single entity). A mail message is scanned only if one or more
of its extensions match the MIME type/subtype settings on a filter rule with
Virus/Spyware Scan selected.
If this check box is clear, each piece of the mail message will be scanned
and handled independently.
6 Select Discard mail with denied attachments if you want to discard mail
once a MIME/Virus/Spyware filter rule denies its attachment(s). If you select
this option, files will either be discarded silently (sender is not notified) or
returned to sender, as specified by the Rejected Mail Handling option
selected on the Mail (Sendmail) Control tab.
If this option is not selected, the message is sent on without the denied
attachment.