Airmail came out of beta today. I’ve been using it for a few weeks now and can happily say that there’s finally a replacement for Sparrow on my Mac. In fact, I’ll go so far as to say that Airmail is better than Sparrow which has existed, unchallenged, on my Mac for years.
Airmail sports a fantastic interface and great support for IMAP (I use it for Fastmail). It has taken over as my main email client and I couldn’t be happier with it.