Thanks for writing in, sure it depends on what the person is doing right?  If it’s just a burner account for forums then proton is fine.  If it’s your whole life’s business via email, then self-host.  If that’s too much trouble, Simplified Privacy offers a service to setup a self-host email on a 1 CPU 1 RAM VPS for you, (with open source email, chat, and cryptpad), and then hand over the credentials to you.  We guarantee it won’t be spam, or your money back.
https://simplifiedprivacy.com/email-cloud-combo/