Mail::SpamAssassin::Plugin::URIDNSBL(3pm)

NAME

URIDNSBL - look up URLs against DNS blocklists

SYNOPSIS

loadplugin    Mail::SpamAssassin::Plugin::URIDNSBL
uridnsbl      URIBL_SBLXBL    sbl-xbl.spamhaus.org.   TXT

DESCRIPTION

This works by analysing message text and HTML for URLs, extracting the domain names from those, querying their NS records in DNS, resolving
the hostnames used therein, and querying various DNS blocklists for
those IP addresses. This is quite effective.

USER SETTINGS

uridnsbl_skip_domain domain1 domain2 ...

Specify a domain, or a number of domains, which should be skipped
for the URIBL checks. This is very useful to specify very common
domains which are not going to be listed in URIBLs.

RULE DEFINITIONS AND PRIVILEGED SETTINGS

uridnsbl NAME_OF_RULE dnsbl_zone lookuptype

Specify a lookup. "NAME_OF_RULE" is the name of the rule to be
used, "dnsbl_zone" is the zone to look up IPs in, and "lookuptype" is the type of lookup (TXT or A). Note that you must also define a body-eval rule calling "check_uridnsbl()" to use this.

Example:

uridnsbl URIBL_SBLXBL sbl-xbl.spamhaus.org. TXT
body URIBL_SBLXBL eval:check_uridnsbl('URIBL_SBLXBL') describe URIBL_SBLXBL Contains a URL listed in the SBL/XBL blocklist

urirhsbl NAME_OF_RULE rhsbl_zone lookuptype

Specify a RHSBL-style domain lookup. "NAME_OF_RULE" is the name of the rule to be used, "rhsbl_zone" is the zone to look up domain
names in, and "lookuptype" is the type of lookup (TXT or A). Note that you must also define a body-eval rule calling
"check_uridnsbl()" to use this.

An RHSBL zone is one where the domain name is looked up, as a
string; e.g. a URI using the domain "foo.com" will cause a lookup
of "foo.com.uriblzone.net". Note that hostnames are stripped from the domain used in the URIBL lookup, so the domain "foo.bar.com"
will look up "bar.com.uriblzone.net", and "foo.bar.co.uk" will look up "bar.co.uk.uriblzone.net".

If a URI consists IP address instead of a hostname, the IP address is looked up (using the standard reversed quads method) in each
"rhsbl_zone".

Example:

urirhsbl URIBL_RHSBL rhsbl.example.org. TXT

urirhssub NAME_OF_RULE rhsbl_zone lookuptype subtest

Specify a RHSBL-style domain lookup with a sub-test.
"NAME_OF_RULE" is the name of the rule to be used, "rhsbl_zone" is the zone to look up domain names in, and "lookuptype" is the type
of lookup (TXT or A).

"subtest" is the sub-test to run against the returned data. The
sub-test may either be an IPv4 dotted address for RHSBLs that
return multiple A records or a non-negative decimal number to specify a bitmask for RHSBLs that return a single A record containing a bitmask of results.

Note that, as with "urirhsbl", you must also define a body-eval
rule calling "check_uridnsbl()" to use this.

Example:

urirhssub URIBL_RHSBL_4 rhsbl.example.org. A 127.0.0.4 urirhssub URIBL_RHSBL_8 rhsbl.example.org. A 8

ADMINISTRATOR SETTINGS

uridnsbl_max_domains N (default: 20)

The maximum number of domains to look up.

NOTES

The "uridnsbl_timeout" option has been obsoleted by the "rbl_timeout"
option. See the "Mail::SpamAssassin::Conf" POD for details on
"rbl_timeout".

perl v5.8.8 2008-Mail::SpamAssassin::Plugin::URIDNSBL(3)