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Protocol filtering
This sub-section allows you to define protocol filtering and block spam sent by certain botnets
(Figure 7-2):
The following actions are possible:
§
Delaying.
§
The number of minor stretches to the protocol accepted
.
§
The number of major stretches to the protocol accepted
.
Figure 7-2
Filtering section – Protocol filtering
Domain filtering
This sub-section allows you to act on a number of domain filter settings
:
(Figures 7-3 and 7-4)
§
Protocol senders (
Mail From
:)
.
You can deny or allow certain mail domains
.
If allowed
,
the
messages will be tested by sender domains
.
§
Message senders (
From:).
You can deny or allow certain message senders (the name is the
one seen in the e-mail software)
§
DNS
.
You can enable this check which ensures that the domain name announced exists in the
DNS entries
.
You can also enable SPF (
Sender Policy Framework) to compare
IP addresses
of legitimate servers for a domain name and the announced server.
Do note that automated spam robots tend to rush the connection when they do not get an
immediate response. This option allows delaying the response to a connection request and to
close the connection if the remote server rushes sending.