Or, host your own on your own metal, to avoid depending on any third party. Alternatively, if you are ok with semi-dependence on a third party, get a $5/mo Linux VPS, and host your E-mail there.
With your own Linux instance, you can host whatever you want, have full control, can host other services too like www, git, whatever, and have the assurance that you're not going to suddenly lose access because AI-BOT-204432 decided you violated some obscure terms of service. I've been doing this for close to a decade now (exim + dovecot for E-mail), and it works great. Back in the 90's, this used to be the default. How did we end up in this world where we so utterly rely on 3rd parties for such everyday critical Internet services?