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SpamAssassin by Alistair McDonald

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SURBLs

Spam URI Realtime BlockLists are a relatively recent technique and SpamAssassin 3.0 supports a relatively small number of SURBLs. SURBLs are configured much like RBLs. SpamAssassin 2.63 can use a different plug-in, described later. Details on SURBLs can be found at http://www.surbl.org.

The SURBLs are defined in /usr/share/spamassassin/25_uribl.cf. An example definition is shown below:

uridnsbl URIBL_SBL sbl.spamhaus.org. TXT
header URIBL_SBL eval:check_uridnsbl('URIBL_SBL')
describe URIBL_SBL Contains a URL listed in the SBL blocklist
tflags URIBL_SBL net

One set of definitions appears for each SURBL configured.

As with RBLs, the SURBL rules set the tflags to net, to enable timeouts to be used, and to enable the rules to be switched on and ...

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