McAfee SG310, Administration Manual

Page: 235 / 412

McAfee UTM Firewall 4.0.4 Administration Guide 235
Firewall menu options
Antispam (TrustedSource)
1
Select Firewall > Antispam > TrustedSource tab. The TrustedSource page appears ( Figure 235 ).
Figure 235 Antispam TrustedSource page
2
Select the Enable TrustedSource checkbox.
3
Set the reputation value in the Reputation Threshold field. Messages from senders with reputation
scores above that value are rejected. For more information, see
TrustedSource Reputation Scores .
• Default: 80
• Range: -140 t140
4
Enter your SMTP mail server address of your LAN in the Destination SMTP server field.
5
[Optional] To enable source address translation, select the Source NAT connections checkbox. This
enabled by default option prevents your mail server from being turned into an open relay if it is configured
to trust and forward messages appearing to originate from the LAN address of the appliance. If enabled,
the apparent source address for connections to the internal SMTP server is one of the WAN addresses for
the appliance. If disabled, the apparent source address is from the LAN side of the appliance. An open
relay configuration allows anyone on the Internet to send email through your appliance.
6
[Optional] Enter a descriptive name in the SMTP Banner field. The name entered here appears in the initial
text banner that is presented to incoming SMTP clients. The default is “SMTP Passthrough Proxy.”
7
If you are experiencing time-out problems, adjust the value in the Network timeout field. Typically, the
default is adequate.
• Default: 180 (seconds)
• Can be a value of 1 or greater
8
To set the maximum number of simultaneous SMTP connections, enter a value in the Maximum
simultaneous SMTP sessions field. Increasing this value increases the resources consumed by
TrustedSource filtering.