Postbox is #12 in Top 10 Email Clients

https://www.postbox-inc.com/
Postbox
Power Email App that supports a full suite of keyboard shortcuts, an extensive set of filters/rules, and intuitive swipe actions on macOS to dispatch messages in a flash.

Positions in ratings


#12 in Top 10 Email Clients

Alternatives


The best alternatives to Postbox are: Thunderbird, Mailbird, Spark, eM Client, Apple Mail, Outlook, Airmail
See also:
Top 10 Email Clients for Work