In Sparrow, a fantastic and customizable email client, you can use a three-finger swipe up and down on your trackpad to move between messages. This works whether you have the message panel hidden or shown (⌘-⇧-T or Window > Message Panel), and it’s a great way to move quickly between conversations without having to mouse over and click on each one.

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💻 Mail: Open messages in Split View when in full screen

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