Steve Freegard of Fort Systems Ltd. reports that milter-uri.pl is a basic Sendmail milter written in Perl using Sendmail::PMilter and SpamAssassin libraries.

http://www.fsl.com/support/milter-uri.pl

By default it uses "the 20_uri_tests.cf rules file (so it is relatively light) to strip the URI's from a message and then check them against" SURBLs. Other SpamAssassin rules should be configurable.

Jeff C.