[Mimedefang] Almost OT: AT&T patents anti-antispam technology

[Kenneth Porter]

Has anyone seen the patent?

> The patent details a way to trick filters that compare digital messages to
> known pieces of spam, altering each message so that no two are exactly the
> same.
> 
> "In this way, spam countermeasures based upon duplicate detection schemes
> are foiled," according to the patent.

This sounds pretty basic. I'm wondering what details they're patenting that
are new?