Proton Mail

Pros: - Easy to use,
- Open source,
- Possible to use with a custom domain (requires a premium subscription),
- Privacy orientated (something truly rare these days!)

Cons: - Could allow for more domains in the premium non-business plans
- The IOS app is somewhat bug-prone and could use more polish and if possible integrate more with the system.
- No MacOS app

Overall: ProtonMail is a great privacy orientated email provider, the pricing can leave a bit to be desired depending on your use-case but otherwise I would strongly recommend it.

Pros: The web client is great for all my needs, and ProtonMail is a privacy-respecting e-mail provider, based on Switzerland.

Cons: No IMAP support on the free plan, and you also need to use an app for that to happen.
Low storage - only 500 mb.
My grandparents have used ProtonMail for their e-mails (I created so they can use some government services), and some of those services would not recognize.

Overall: Overall, ProtonMail is a solid choice for a privacy-respecting e-mail provider, there are some issues, like services not recognizing your ProtonMail address, but it's only minor.

Pros: The # draw is that this is a secure, privacy-focused email alternative. It also has a very sleek interface.

Cons: Understandably, it does not offer a large amount of storage, only 500MB, so no hoarding like you would with gmail.

Overall: This is one of the best privacy centric email services around. If more of them nailed the user interface like this one does, Gmail should be scared.

Pros: Can encrypt if you want, or not. All settings are available and it is easy to set up everything. Have a free version that I am currently using and it is not restricted in any way. Allows for two-factor authorization.

Cons: Just couldn't find any cons as of yet. Have used the program for about 3 months.

Overall: I really like using Proton mail. The best part is that I am no longer tied to Google mail in any way and have removed all four of the accounts that I had there. Proton mail has given me the security of knowing that I have a level of privacy.

Pros: ProtonMail offers encrypted emails, so it's a good option for those looking for a more private, secure email service compared to the bigger ones out there like Gmail and Outlook. It's got fairly priced options, and the free version isn't too bad either.

Cons: Much like Tutanota, however, you can't use this as your only email account because a lot of services won't recognize it as a "valid" email service even though it very obviously is.

Overall: I keep going back and forth between this and Tutanota. For the time being, I prefer Tutanota though I think ProtonMail is the more polished of the two. Both are good services for encrypted mail. I'd give them both and try and see which one you prefer.

Pros: I love that my emails are end to end encrypted. I found out that Gmail reads my emails and I quickly signed up for the free version.

Cons: People look at me weird when I give them my email address now.

Overall: Overall the free version is great unless you are going to be sending a ton of emails. It works for me and I feel safe using it.

Pros: Open source
Easy to use
Good security and privacy
Multi level security and encryption
Free tier
Mobile version alongside web version

Cons: Limited storage in free tier means you will need to free space for long term use.

Overall: ProtonMail is a mail service with focus on secure communications. It promises data protection and provides end to end encryption. It is open source and available to use for free but with limited storage.

Pros: User-friendly platform.
256 bit end to end encryption.
Free version & Inexpensive upgrades.
Easy to use API.
2 Factor Authentication.

Cons: Slow customer care service.
Only 500 Mb storage for free tier.

Overall: ProtonMail offers an easy to use encrypted mailing service, which is multi-platform, secure and affordable.