Nothing wrong with Thunderbird, setup your own domain name and a small mail hosting package from said provider and there you go, no more adds and intrusive email scanning, put's you in more control of your email/data and not in the hands of big corp!

- I think you should research all the "service" that popped-up first. DON'T CLICK IT! Open a new tab and search, sometime it's may just clickbait spam.

- I don't think thunderbird is problem here.

- I strongly recommend Tuxgamer solution on using your own hosting mail. Still, if you cannot afford on those, I suggest you to use Proton Mail. Still, I'm not recommended you to use Proton Mail if you're doing for banking purpose based on my experience, but that's another story.

- Changing password every months aren't recommended anymore. I hated to say this, 2FA at least with other emails is basic protection security. Much better with your mobile phones, even do personally I really hated that.

Tutanota, Protonmail, IndieHosters... there is plenty of alternatives :)

Quoting: tonR- Changing password every months aren't recommended anymore. I hated to say this, 2FA at least with other emails is basic protection security. Much better with your mobile phones, even do personally I really hated that.

I have 2FA on ever since they first introduced it, someone still got enough info on my account to register that service from me.
I also researched the service, it was a legitimate email from an online payment company. As far as i could tell, they used my email address and another persons name to register an account for the service.

Quoting: NasraTutanota, Protonmail, IndieHosters... there is plenty of alternatives :)

I don't need encryption, since there is virtually nobody that uses it, otherwise i could probably just use gpg for encryption and signing. The big problem is that third persons get access to my mailbox.

Try Kolabnow: https://kolabnow.com

You are also going to be supporting FOSS by using it. It has a yearly subscription fee.