Agreed! It had great functionality, including customizabiltit and the best approach to separating wheat from chaff I&#x27;ve seen to date. Spark is entirely client side (Though they&#x27;re hinting at adding server-side features; as long as it doesn&#x27;t include server-side access to my email no problem).<p>Mac client slated for early 2016. They support plain IMAP (yes!) and even Exchange.