I still deeply miss Mailbox (the cross platform app bought and abandoned by Dropbox). It was SO fast and sleek. Emails appeared damn near instantly, the app nev

I still deeply miss Mailbox (the cross platform app bought and abandoned by Dropbox). It was SO fast and sleek. Emails appeared damn near instantly, the app never lagged, and actions taken locally were reflected remotely near instantaneously. Email clients are a lot better now than then. In fact the best features of Mailbox (swipe to /action/ and snoozing) has been copied by basically every email client now. However, I have yet to find an email app for either macOS or iOS that's as consistently fast.