As it becomes more widely adopted, it will help client-side mail sorting so that the filtering rules don't have to use unreliable heuristics. IMC's mailing lists have been using this header for over a year, and many newer mailing list packages have added the header as well. This document will hopefully help deter them from becoming the new pariahs of the Internet by showing them the positive things they can do with marketing through Internet mail. We have yet to rid ourselves of spam. The focus is on how fight spam, particularly for ISPs and large enterprises.
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