Very good app, but…

This is by far one of the best email client apps of the latest times, BUT...
My issue is this: you cannot export to MBOX or PST the local email folders; thus, at the moment, if you switch to Airmail, you cannot switch back to your previous email client with all your emails: they will be “trapped” in Airmail. This is a big issue for me, since I have 10-15 GB of old emails and I don’t want to be stuck in an unexportable email client: what if I change to a PC or to Linux? What if I would want to switch back to Mail.app or to Outlook?
For this reason I will wait for this feature to be implemented before doing the switch from Mac Mail app.

Aprzk about Airmail - Lightning Fast Email, v2.6.1