Use PGP!
There are many reasons to use PGP, chief among them the ability to establish a digital identity that prohibits fakery, by digitally signing your mail (and, perhaps, blog comments). The more paranoid (perhaps rightly so) will also point out that encrypting all of your correspondence is good practice.
The recent release of updated PGP software for Mac OS X and Windows is a good sign that PGP, which had languished for a while under the reign of NAI, is making a comeback, as it were. If you prefer a free software alternative, install MacGPG (just updated per the GnuPG 1.21 release); the GPGMail plugin adds integration with Mail.app.


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