My default email program was just upgraded :

About the Postbox 1.1.2 BETA
Submitted Mar 05 by Sherman Dickman
A new BETA version of Postbox is available for testing which contains a number of improvements and bug fixes for Windows and Mac. Additionally, Postbox now works with Things and OmniFocus to make you even more productive!

To get started, please download and install the Postbox 1.1.2 BETA, and for Mac users, the most recent version of Things (1.2.11) or OmniFocus (1.7.5).

[From Postbox Support : About the Postbox 1.1.2 BETA ]