GPGMail 1.1.2
Hot on the heels of Matt Haughey’s fine post about the difficulties of using encryption in Mail.app, comes an update to GPGMail.
This plugin is a front end for gpg and allows you to send and receive encrypted messages. It extends Mail.app’s in-built encryption features in several useful ways.
You can read about the features it offers and its limitation on the GPGMail site. 
The new version fixes a compatibility problem with MailTags, needs GPG 1.4 or better, works better in Panther, has a Dutch localisation, works better with AppleScript-generated windows and solves a number of other bugs. (Full changelog
).
The developer warns, “GPGMail is a complete hack, relying on Mail’s private internal API. Use it at your own risks!” But don’t let that put you off.
Get it from the GPGMail web site. 
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Tags: Apple Mail, applescript, certificates, encryption, GPG, mail.app, mailtags, PGP, plugin
