Save the disk image as postbox.sparsebundle in the root directory (which is most likely 'Macintosh HD')Ħ. Use the following settings (the size can be whatever you'd like, but sparse bundles only consume the space they need to, so I suggest using a generous size to avoid potential headaches later)ĥ. From the File menu, select New > Blank Disk Image (option + command + N)Ĥ. Open Disk Utility from the Utilities folder (/Applications/Utilities)ģ. 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).īefore we get started, be aware that this method utilizes an encrypted sparse bundle, which is only available in Leopard and Snow Leopard.Ģ. 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. 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.
