Get your own domain name and a low cost hosting package. Most include email service, some, with ‘unlimited’ email accounts.
That way you don’t have to worry about a company going out of business, being compromised by the Feds or being taken over by lefties or crooks.
If you are emailing people on other services, especially like on G-mail, it doesn’t matter how secure your own email host is, your messages are vulnerable.
That’s why all my friends and associates have email accounts on at least one of my own domains, so no one is reading our messages to each other.
My domain name runs $5/month about $24 once a year for name renewal and privacy package.
totalchoicehosting.com is the best.