The one I like most is Mailbox.org. Great domain name for email. Three aliases with the basic account. Offers more privacy than the bigguns. Not a lot of storage, though. Not free, but works out to about $1 a month depending on the current exchange rate (USD vs. EUR).
Thunderbird
Thunderbird is the leading free and open-source email, calendaring, newsfeed, and chat client with more than 20 million active monthly users across Windows, macOS, and Linux. One of Thunderbird's core principles is the use and promotion of open and decentralized standards.
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Well, you're paying for increased privacy in money and (imo) security.
I begrudgingly stick with gmail every time I consider otherwise, and having one of the world's biggest IT security teams keeping it safe is one of the reasons. It's unfortunately how much they get to harvest my data, but I suppose I'd rather them than a scammer.
I don't see how an encrypted service like TN or PM would be less safe than gmail. Quite contrary. Leaks so often come from insiders.
I've been through quite a few security audits, and had to steel-clad quite a few secure systems. Nothing is better than having a dedicated security team for those things. The bigger the better. There's a reason we teach junior developers not to write any "secure" code, even as simple as a login system, on their own.
I can understand why someone might "not see", but as someone who has seen security done wrong enough times by well-meaning small businesses, I trust the company with the bigger dedicated security team with the better-skilled experts.
What's left is the fact that "everyone will want to hack gmail, but nobody would try to hack TN or PM". Fair enough. But as that taught us growing up: "security through obscurity isn't".
I don't fault people who prefer using these smaller "privacy" companies. But please don't fault people who prefer to stick with the companies who stand tall through constant attacks.