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An Awesome Alternative for Thunderbird Users - Postbox Blog This is not a totally free product, nor is it a totally Open Source product: I have to say, it sounds great. It has an awesome list of features. You can try it before you buy for $9.95. There are no iOS versions available either sadly. In some ways it reminds me a bit of the Sparrow email client (now owned by Google, BTW) for iPhone/iPad and Mac (Mac version is $9.99, but also comes in a Sparrow Lite version ad supported version for free. Both are also available on the Mac App Store). Back to Postbox, as I say it has some great features that can be found on the article and I do mean a lot of great features! And if you are wondering about how Mozilla's Thunderbird announcement impact Postbox ... basically not at all except for the better at least for Windows and Mac users as you can see below: Much more in the article. Of course, not being open source fully, Linux Thunderbird users will likely just move to Gnome Evolution.