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SpamAssassin by Alistair McDonald

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URL Recognition

A Uniform Resource Locator (URL), more correctly called a Uniform Resource Identifier (URI), is typically a web link in a spam email. A Spam URI Real-time Block List (SURBL) is a database of URIs that have appeared in spam emails.

SpamAssassin version 2.63 supports SURBLs via a plug-in, and from version 3.0 onwards, SpamAssassin supports SURBLs without the need for a plug-in.

These tests use a small amount of network I/O while querying the database. They are suited to parallel processing.

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