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30 Administrator’s Guide SurfControl RiskFilter - E-mail V5.2.4
S
YSTEM
S
ETTINGS
Receive Settings
2
RELAY CONTROL
RiskFilter enables you to stop your e-mail system from being used as an open relay by spammers. Relay
control limits the server to only relaying e-mails for specific domains. Use the Relay Control screen to
control relaying to and from your system.
Figure 2 - 17 The Relay Control screen
SPF Authentication Configuration
You can ask E-mail Filter Appliance to check that messages are actually from a legitimate server. If
enabled, this feature checks messages against the SPF record belonging to the sender and, if the server is
not listed, the message will be rejected. This stops spammers forging messages that seem to be from the
users themselves.
Controlling relaying of messages
Messages from IP addresses that have been added to the ‘Accept e-mail for relay from the following IPs’
list will be accepted for relay without any of the Connection Control, Relay Control, Message Control,
Directory Attack Control or User Validation processes being performed on them.
To control relaying of messages:
1Select Receive Settings > Relay Control from the System Settings tab.
2 Select the Perform SPF checking against e-mail sender check box if you want incoming message
senders to be checked against an SPF (Sender Policy Framework) record. When SPF checking is
selected RiskFilter will reject mail senders who fail to meet the SPF policy of the sending domain. Any
other messages will be accepted, unless the following are selected:
• Reject mail from senders with no SPF records – When SPF checking finds that the senders
domain does have an SPF record, reject the mail.
Note: If you wish to define access to reports and logs by domain, you will first need to add these
domains to this page.