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

NAME
URIDNSBL - look up URLs against DNS blocklists

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.

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

CONFIGURATION

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".

    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, a non-negative decimal number to specify a bitmask for RHSBLs that return a single A record containing a bitmask of results, or (if none of the preceding options seem to fit) a regular expression.

    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

uridnsbl_timeout N		(default: 2)
    Specify the maximum number of seconds to wait for a result before giving up on the lookup. Note that this is in addition to the normal DNS timeout applied for DNSBL lookups on IPs found in the Received headers.

uridnsbl_max_domains N		(default: 20)
    The maximum number of domains to look up.

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.