Secure Computing SG300 User Manual page 197

When Inform requesting server of rejected mail is enabled the SnapGear unit rejects
incoming mail that is detected to have a virus, and informs the requesting SMTP server
that the mail has been dropped. This is the default and recommended behavior.
When Inform requesting server of rejected mail is disabled the SnapGear unit accepts
and then subsequently drops incoming mail that is detected to contain a virus. The
requesting mail server believes the mail was delivered correctly, however the SnapGear
unit drops the mail without a notification being sent to either the sender of the mail or the
requesting server.
Typically, the default Network timeout for this is appropriate and should only be
changed if there are time-out problems.
You may specify the Maximum simultaneous SMTP sessions to set the maximum
number of simultaneous SMTP connections. Increasing this increases the resources
consumed by virus scanning.
Click Submit.
Web
The SnapGear unit can scan incoming web traffic for viruses.
Note
Enabling this automatically enables Access Control.
Check Virus check web downloads.
Check Reject overly large downloads to have the SnapGear unit treat oversized
downloads as potential viruses and reject them. The definition of an overly large
download is specified by the Maximum size field on the main Antivirus tab.
Click Submit.
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Firewall