Yandex.Mail
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I've used Yandex Mail for a couple of years, and really liked it. Good interface, easy to use, no security issues that I'm aware of. However I've recently started to get EVERY outgoing mail blocked and labelled as spam. I contacted their customer service but they couldn't tell me any more than was available on their Help pages, and now they've stopped responding completely. Would be great if they'd sort this problem out but until thy do I can't recommend it.
They don't require a phone number when you sign up. BUT...... once you created an account, in day or two it will say your account is block because it was hacked or something like that. They will require a phone number to send you an SMS message to unlocked the account. This happened twice (2 new accounts), they just want your phone number.... Thumbs Down!!!
I've been with Yandex for many years. Loved it. It was the best until lately when they blocked me and said I had been hacked. I tried getting back in answering all their security questions and when it came to the phone # it would not let me go any further because I don't have a mobile phone. I contacted them and they said I had to take a selfie holding my personal ID to prove who I was and then they would let me back in. Or set up a new account. Well NO WAY! We sent many emails back and forth and they told me to do it the automatic way and I told them it would not work. They said that's too bad and if I want their help I had to give them a selfie picture holding a passport or drivers liscense. Needless to say I've left them and it's very sad because it was the best mail service I had found. The other thing that was happening is that they were posting advertising in Russian plus people were complaining that at the end of the emails there was strange posts that didn't make any sense. I never want anything to do with Yandex again.