Note: A service group cannot be used for email filtering
It is not possible use a custom Service Group object for IP policy based email filtering
which combines any of the IMAP, POP3 or SMTP protocols. Separate IP policies with
separate services for IMAP, POP3 or SMTP must be configured.
General Settings
The following options are available for all types of traffic.
• Anti-Spam
When enabled, anti-spam scoring is applied to emails to determine if it could be spam. The
anti-spam feature is described further later in this section.
By default, this option is disabled.
• Blacklist Subject Tag
This is the text inserted into the subject field of an email if it is found on the blacklist for this
profile.
IMAP Settings
The following options are available for IMAP traffic:
• Hide User
If the wrong credentials are sent to this server, enabling this option prevents the server's error
message being returned to the client. Some servers might send an error message which gives
an indication which of the credentials is incorrect and this could be helpful in a security
attack. Instead, NetDefendOS will send back its own general error message to the client.
By default, this option is disabled.
• Block Plain Text Authentication
When enabled, authentication using credentials sent in plain text will be blocked.
POP3 Settings
The following options are available for POP3 traffic:
• Hide User
This is functions in the same way as described in IMAP above.
By default, this option is disabled.
• Allow Unknown Commands
When enabled, commands that are not part of the standard protocols will be allow. It is
Chapter 6: Security Mechanisms
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