What I mostly mean by that are email clients that just use straight IMAP to talk to a server and don’t route your emails via a third party server. The built in app does that, but apparently has some security issues that at least several people are taking seriously.

All the other email clients I could find either require you to sign up for their service (not an option, I run my own email server) or seem to route/mine your email in exchange for convenience features.

Don’t mind paying for the app, but I don’t want a subscription model either. Any apps I should be looking at other than an ssh client on my phone?