Plain Email is an app concept for efficient one-touch e-mail processing. The program stays true to the GTD methodology with only four distinct actions available: done, respond, delegate, and defer. There is no skipping or snoozing. If the e-mail requires more time, you have to book it on your calendar. All the actions are accessible with the keyboard.
Mia for Gmail (was Notifier Pro for Gmail) is a desktop Gmail client which sits politely in your menu bar.
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