Symantec Security 5600 Series, Security 5400 Series,Clientless VPN 4400 Series, Administration Manual

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343 Preventing attacks
Protecting your network resources from virus infections
Related information
For further information related to this topic, see the following:
■
“Antivirus Mail Attachment Restrictions tab—Restricted Mail Attachment Filename dialog box”
on page 634
■
“Adding antivirus protection to a rule” on page 347
Filtering mail by binary file size
When filtering mail by binary file size, you specify one or more file sizes that are known to be threats
and specify how the security gateway handles messages that contain attachments of any of the listed
file sizes. You can configure the security gateway to reject the entire message or deliver the message
with the attachment removed. Any attachments that do not match a specified size are not removed and
are delivered with the message.
Prerequisites
None.
To filter mail by binary file size
1 In the SGMI, in the left pane, under Policy, click Antivirus .
2 In the right pane, on the Mail Attachment Restrictions tab, to the right of the Binary file size list,
click
Add .
3 In the Restricted Mail Attachment Size dialog box, in the Mail attachment size text box, type the
maximum file size to permit for a binary file attached to an email.
4 Click OK .
5
Under the Binary file size list, select one of the following responses:
6 Optionally, do one of the following:
■
To save your configuration now and activate later, on the toolbar, click Save .
■
To activate your configuration now, on the toolbar, click Activate .
When prompted to save your changes, click Yes .
7
To apply these settings, create a rule and enable the appropriate actions on the Antivirus tab.
Related information
For further information related to this topic, see the following:
■
“Antivirus Mail Attachment Restrictions tab—Restricted Mail Attachment Size dialog box” on
page 634
■
“Adding antivirus protection to a rule” on page 347
Block email message The security gateway rejects any message that contains an attachment with a specified
file size.
Remove attachment The security gateway removes any attachments with a specified file size and delivers
the remainder of the message, including attachments with names that do not match a
specified file name. The mail message is not updated to indicate that an attachment has
been deleted due to a mail policy violation unless you activate the mail message update
feature.