I mean Proton seems like a good (although extremely expensive) option, but these small companies could go out of business on a dime which is a problem when the effort to switch is a titanic undertaking.
If you use your own domain, it's just as simple as switching some MX records (and the TXT or whatever for DMARC etc)
If you use your own domain, it's just as simple as switching some MX records (and the TXT or whatever for DMARC etc)