Take Thunderbird, make it look better, give it more features--especially for users of Gmail... and you've got Postbox. Many, if not most, of the useful add-ons for Thunderbird can work in Postbox with the addition of a few lines in the add-on's install.rdf file (just to let the add-on recognize Postbox).
I switched from Thunderbird to Postbox.
Like Thunderbird, but with more features.
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