@LewisWorkshop I use Proton - excellent in the web, and decent in Android.
I think I have a referral code if you want the premium version, but the free tier is decent.
@LewisWorkshop thunderbird does a pretty good job as a client.
I self host but i'd hesitate to recommend it, as you'll likely have problems sending/receiving from/to Gmail and office365. (Eg Hotmail/outlook silently discarding emails you send one of their users).
I've heard people recommend fastmail and proton.
I thought @beasts sell mail hosting ?
Gandi probably worth considering.
@LewisWorkshop "Thunderbird?"
I've used it for many years. Occasional annoyances pop up but it's generally good. Note that it's only a mail client (well, only mail/RSS/usenet/calendar client). It doesn't provide a mail server account so you'll need one of those as well. Gmail provides both in a single package.