Proton Mail
proton.me
Encrypted mailbox where the provider cannot read the contents of your messages
simplelogin.io
Gives every service its own email alias so you can cut one off without moving.
Generate an alias per site, hand that out instead of your real address, and mail forwards to your actual inbox — replies go back out through the alias, so the sender never learns the address behind it. When a site leaks or starts spamming, you delete that one alias and nothing else changes. Open source, and now part of Proton with Proton Pass integration.
Questions
A genuinely usable free tier with paid plans for volume or team features. Free is ten aliases and one mailbox; unlimited aliases, custom domains and starting new mail from an alias need the paid tier.
Yes. SimpleLogin sends your input to its own servers to process it. That is fine for public material; for anything containing personal data, use one of the on-device tools instead.
Free is ten aliases and one mailbox; unlimited aliases, custom domains and starting new mail from an alias need the paid tier.
Alternatives
Same category or same task, ordered by how closely they overlap.
proton.me
Encrypted mailbox where the provider cannot read the contents of your messages
formspree.io
Gives a static site's contact form somewhere to POST that emails you the answers
mail-tester.com
Send one email to the address it gives you and get a spam score out of ten
mailerlite.com
Sends a newsletter to a small list on a free tier that does not expire
mailinator.com
Any address at mailinator.com already has an inbox you can read without signing up
mailtrap.io
Catches the emails your app sends in a fake inbox so no real person gets them