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Well, I finally got around to getting a free certificate and enabling Mail.app to be able to sign and encrypt email. [This article][1] was invaluable. **Key point:** If you get a certificate from [Thwate][] you must use [Firefox][], Safari doesn’t work. [1]: http://www.macdevcenter.com/pub/a/mac/2003/01/20/mail.html [thwate]: http://www.thwate.com [firefox]: http://www.firefox.com