I use Protonmail as they offer quite a bit of privacy, offer lots of features, and are free. I particularly like that they protect from tracking pixels notifying the sender you read their email.

Posteo.de - 100% renewable energy. Full industry standard encryption. No tracking, no adds. Annual transparency report. Supporting social and environmental efforts. Great treatment of their employees.

Is self hosting a valid answer?

I host my own email.

I'm oldschool.

I've had my own domains and mail servers for the past 3 decades and will maintain them for as long as I live.

And these days, all but the storage runs of Pi3, so it's barely using any power either.

I use Fastmail - not too expensive, really good webmail client, has working shared calendar that isn't OWA, and isn't advertising scraping my e-mail. I would have liked a more private service, but back when I moved from self hosted to a service, that was about the best I could get that also had calendaring.

Any email with cock in the name will trigger filtering. It also has the side effect of making me unemployable

Proton (free - 1GB storage, 500MB before doing 4 "tasks") for family, friends, and business types uses, although I'd rather have an integrated calendar (instead of it being a separate app).

Tutanota (free - 1GB storage) for bills, purchases, etc., basically everything else, because I'm never going to say "my email is [email protected]" to anyone I know, especially business acquaintances. So far, I like Tutanota more than Proton, especially the integrated calendar, but that name...... sounds like something my mother or grandparents were scammed into using.

On desktop, I'm currently using Thunderbird (TB) for a couple of older gmail accounts (in the process of transitioning away from), although I hate the recent update to TB. Haven't tried the Tutanota desktop app yet, but web version of email & calendar work adequately. Maybe I'll transition from TB now, after their recent changes.

Considered mailbox.org, but I'm not going to pay for it (no free version), especially when they don't at least have a cell app. Skiff may be worth looking at. Can't recall why I didn't try them.

EDIT: I've now installed Skiff (free - 10GB) as well and liking it so far. Using webmail seems easy and straight forward, cell app looks about the same (but haven't spent too much time on it yet). REALLY like that you basically get 4 email accounts (1 main and 3 alias account names), which is different than Tutanota and Proton. With the different aliases, this gives me an option to use Skiff for everything (if I choose to "put everything in one basket" at some point). Skiff sounds a little better than "Tuta" for business acquaintances as well, but not by much. No integrated calendar, but significantly larger storage is a plus.

I tried Proton, even paid for a year. But hot damn the Android app is garbage. So I've moved to Fastmail and I like it a lot. The app is snappy and I love that it has calendar, contacts, mail, notes, and files storage all in the same app. I used a custom domain with Proton so wasn't hard to switch to a different provider. Just wish I would've known how bad the mobile app was before I plunked down the money.

I use protonmail, simplelogin (for email aliases) and tutanota.

This one isn't for daily private use, more like a throwaway email service for when sites and services have no earthly business asking your email other than to track you and send junk mail...

dispostable.com

Edit: You don't even have to register an account with them, just make up an email with them and it should just work for most sites.

I use irrelevant at dispostable dot com to use Walmart's free WiFi, the password on Walmart's side is Walmart1 hahahaha!

Protonmail, but not really because of encryption. I just liked their Android client and webmail the most. I've had sensitive backups on Proton Drive for a long time, so that also played a role in the choice.

I hosted my own server for quite a few years, but the SMTP clients (Thunderbird, Evolution, K9 mail) all doing things slightly differently made me give up. Biggest push was that K9 mail didn't really move deleted mail to trash. These were probably dovecot configuration issues, but I got tired of searching for solutions. Never had any deliverability issues.

Purely mail.

$10/year.

Every provider out there encrypts mail at rest. You're exchanging emails with Gmail, Yahoo or Hotmail anyway. Pretending like your email is any safer with Proton or clones is a waste of money imho.

Tutanota. I used to use Proton, but they don’t encrypt folder names, which is a deal breaker. Tutanota does, and they’re also a privacy respecting, reputable, decent service.

I use runbox. It costs money, but is affordable. They also take privacy and security seriously, and they take steps to help the environment when possible.

any competently run service that gets you away from the tech conglomerates will work

fuck proton mail, bring your own encryption

Selfhosted mail-in-a-box solution. Easy to maintain and configure.

• It just works

I'm in the process of migrating to Proton from Gmail and Outlook. All 4 mailboxes imported, now just the tedious job of updating credentials on all the websites remains...

Paid Proton Mail with my own domain name and own PGP keypair. Although it now has a way to securely search mail, I use the bridge service to allow Betterbird mail to sync my mail to my PC for searching.

Haven't seen his answer here yet, but I use Zoho. It has a free tier IIRC and supports custom domain.

Not sure how private it is, tho.

I use Tutanota I think it's a really good private email client.