@sumudu all personal use. Dispatch was my primary and only email client for a long time, and I still really like the app. I've varied between Outlook and Spark as my main email client, and have finally settled on Spark. I like Airmail, but it feels incomplete. Airmail cuts off long emails without a way to read the full email.
As far as Fastmail goes, I've been really happy with the service and haven't had any issues with the native app
// @paulgit