Airmail FTW
sef.kloninger.comI use Airmail, but man, I have never encountered a buggier app.
Every release breaks introduces a new little bug; when you report it, they advise you to use the newest beta, which is okay for a while, but then there is a new bug, a new beta, more bugs... I have a long list of tickets reported, often about really trivial things that escaped their QA. To make things worse, the developers are Italian, and they English is extremely poor, almost non-existent.
I keep waiting for a proper replacement for Sparrow. Airmail is decent, but I can't in good conscience recommend it to anyone.