excellent techsupport too

I really like how this app handles my mail.
The only issue I had (my issue, not Airmail’s as it turns out) was getting Yahoo to work with 2 factor authentifications. I had the same issue with a couple of other email apps that I was trying out. None of the other apps offered any assistance that got me connected to Yahoo. Airmail did. Within hours of fairly prompt email responses from their tech support, Yahoo was up and running. Kudos.
And, I get email notifications pronto, not half an hour later.

Blerbyq about Airmail - Lightning Fast Email, v2.6.1