Tech companies are really trying hard to kill off free email and make it accessible only a web frontend only or a proprietary app.
Use to be if you buy a domain name you could get 5 mailboxes accessible via POP3, IMAP, and SMTP . First google shut down free email hosting and wants to charge $6/mo per address. Then a few years later the other domain registrars followed suit and started demanding the same pricing, even when they already doubled the registration fees.
You used to be able to get 5 email addresses from your ISP. Most of the ISPs have stopped offering email.
Most people these days will have a mandatory Google account and a mandatory Microsoft account to use their devices. It would be nice to use both of these accounts in the same email app. Wrong! Both Microsoft and Google have decided that IMAP, POP3, and SMTP passwords authentication is now insecure and decided that your email client must contain a fully operational web browser to get OAUTH2 tokens and handle the 2 factor authentication that will eventually become mandatory.
Host your own email then... VPS providers treat you with suspicion if you want port 25 open and you have to submit a request to open it. If you want to send email, you'd better be a system admin god to get all the DNS, SPF, DMARK, DKIM to work properly. Your VPS IP address is probably already banned by Microsoft and Google simply for being hosted by a VPS.
The future of email looks to be like this.... You will be allowed one, and one only email address per service, no alts allowed. This will constantly be enforced by 2 factor authentication, tied to your phone. Basic email access will be as tightly controlled as your banking apps. This great for data harvesting and identification of sources of wrongthink. No more giving away your spam email address away when ordering pizza online or joining that loyalty rewards program. They want that information tied to you as well. The goal is to be able to directly associate an email address to an exact person at all times. No deviation from this shall be allowed.