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Re:The Mailocalypse Is Upon Us: Why Isn’t All Mail UTF-8? by gchpaco on Monday June 15, 2009 @01:17PM (#658702)
Among the problems that this has, it will shatter PGP and S/MIME signatures silently.
Re:The Mailocalypse Is Upon Us: Why Isn’t All Mail UTF-8? by dfranke on Monday June 15, 2009 @04:45PM (#659058)
Ding ding ding! You win the thread. It'll break DKIM/Domainkeys too if you have 8-bit characters in your headers.

Paws off my mail, Zed.