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CloseReview for Enigmail by Matson
Rated 5 out of 5 stars
There are more downloads at the developers' site:
http://enigmail.mozdev.org/download/index.php
NB, if you have 64bit or AMD64 Linux, you need the 64bit extension, only available at their site.
Great extension! It's unobtrusive and the initial setup is just this:
1) install ThunderBird (I use Ubuntu, and it's not the default email client)
2) install Enigmail extension
3) Follow instructions http://enigmail.mozdev.org/documentation/quickstart-ch2.php
Note that for users of other OS's, you may have additional steps. Step 3 is basically just a howto and best-practice on how to use the Enigmail Wizard.
BTW, I don't know why it turns off HTML email as the default... I have tested it with PGP/MIME on HTML emails and it seems to work fine...
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