Email client for Apple devices?

Question

iOS

In the nature of my job, I need to use different email accounts. I really like Apple Mail and I have my main mailboxes set up on it, both personal and work. But there are boxes that I need, which I use for part-time jobs and you can’t add them to Apple Mail for a number of reasons.

Please advise what software do you use? I like the simplicity of the visual design, I don't need all sorts of goodies, reminders, additions to the calendar. I need the program to work with mail via imap, work stably and efficiently, without dependencies. So that my correspondence cannot be read, because the developer has crooked services and hands (encrypting and hiding has nothing to do with the backend functionality of the application). Well, it’s good if there is a program for various Apple devices, it’s not necessary, but I would like to, but the main thing is that it be for macOS.

- At one time I tried Spark , but it has problems with a simple setup for Yandex mail. Always dancing with a tambourine, access keys, etc. - I used the purchased Airmail 3
for a very long time, but these bastards, instead of releasing a separate Airmail 4 program, stupidly updated Airmail 3 to version 4 and lure you into buying a "subscription". It launches on the Airmail 3 icon, in the "about the program" version 4 and constantly asks her to buy a bunch of new goodies - what for! And so the interface is overloaded and dofiga unnecessary buns. In general, they upset me, so I started looking.
- Installed Postbox. I like the design, but it works intermittently and slowly. I would have left it straight away (because the rest of the programs from my list are lower in all other respects), but the developer asks $29 a year or $50 forever for the program, which is about 2200 rubles a year or 3800 rubles one time. Moreover, Postbox does not have to say that there was some kind of functionality for that kind of money. Again, I don’t need buns, but 4kR is a bit too much for collecting letters. In general, a little expensive, but if I don’t find an alternative, this is still the first candidate.
- Outlook ? This is the creepiest interface I've ever seen in a mail program! Especially at this moment, the "dark theme" poppy turned on according to the schedule - no, that's not it.
- Canary MailI don't remember why I removed it. It seems that he also could not connect without keys to Yandex mail and there was something else. Lived on my computer for a couple of days.
- Polymail - I read somewhere that there are problems with the security of letters. Again, a subscription. Bastards! Let me buy and use it for 10 years))
- Mozila Thunderbird - the design is obsolete, my design part could not withstand more than an hour of using this miracle.
- eM Client - simple, works, but again a subscription...

Well, probably there are no more options, but what if the public knows other applications? Tell me, huh?

Answer 1

If you are ready to give up gmail goodies or don’t use it, then you can try MailMate , which has a lot of settings, and what Thread Arcs is worth.
Replaced them with Airmail and Spark.
You can wait a little more and wait for Thunderbird to be released on an updated engine.

Answer 2

So Airmail... Although my email templates are buggy (that is, they are completely disabled)...