How to encrypt your Postbox (or other) email on OS X

Even if you're using IMAP to access your email, certain newer email clients like Thunderbird 3 and Postbox will download and store your emails locally in plain text. This leaves many users making a difficult choice between leaving sensitive data unencrypted, or venturing into overkill territory by using a tool like FileVault, PGP Whole Disk Encryption or TrueCrypt - which see you encrypting your entire home directory or hard drive and dealing with a performance overhead. This article will show you how to encrypt only your Postbox email on a Mac, but can easily be adapted to other email clients (or other folders like your Documents folder).

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