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SonicOS Enhanced 4.0 Administrator Guide
To add an RBL services, click the Add button. In the Add RBL Domain window, you specify
the RBL domain to be queried, enable it for use, and specify its expected response codes. Most
RBL services list the responses they provide on their Web site, although selecting Block All
Responses is generally acceptable.
Statistics are maintained for each RBL Service in the RBL Service table, and can be viewed
with a mouse-over of the (statistics) icon to the right on the service entry.
User-Defined SMTP Server Lists
The User Defined SMTP Server Lists section allows for Address Objects to be used to
construct a white-list (explicit allow) or black-list (explicit deny) of SMTP servers. Entries in this
list will bypass the RBL querying procedure. For example, to ensure that you always receive
SMTP connections from a partner site's SMTP server, create an Address Object for the server
you added using the Add button, click the edit icon in the Configure column of the RBL User
White List row, and add the Address Object. The table will be updated, and that server will
always be allowed to make SMTP exchanges.
The System > Diagnostics page also provides a Real-time Black List Lookup feature that
allows for SMTP IP addresses (or RBL services, or DNS servers) to be specifically tested.
For a list of known spam sources to use in testing, refer to http://www.spamhaus.org/sbl/
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