libmail-spf-query-perl 1.997-3 (i386 binary) in ubuntu dapper

Query SPF (Sender Permitted From) to validate mail senders
 The Sender Permitted From (SPF) protocol relies on sender domains to
 publish a DNS whitelist of their designated outbound mailers. This
 module, given an envelope sender, determines whether a given client IP
 is a legitimate mail source.
 .
 This package also includes spfquery, a command line interface to the
 module, and spfd, a query proxy for some mail server configurations.
 .
 For more information on SPF, see http://spf.pobox.com/.