Best yet!
As a power user I’m never really satisfied (of course). I’ve tried them all. Airmail 2, though not (yet) perfect, is the best yet. Found a small glitch when transferring email from one account to another (and yes! you can actually do that! Very handy.) which is being addressed but other than that I love this program. One of the rare ones with both desktop and iOS versions. Tons of options. AND I have to say I love their responsive Support - immediately there for me, even late Friday night - (thanks Sarah).
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Airmail - Lightning Fast Email, v2.6.1