diff --git a/README.md b/README.md
index bdd612ab..ffa1ce85 100644
--- a/README.md
+++ b/README.md
@@ -814,6 +814,7 @@ Table of Contents
   * [pepipost.com](https://pepipost.com) — 30k emails free for first month, then first 100 emails/day free
   * [phplist.com](https://phplist.com/) — Hosted version allow 300 emails/month free
   * [postmarkapp.com](https://postmarkapp.com/) - 100 emails/month free, unlimited DMARC weekly digests
+  * [Proton Mail](https://proton.me/mail) -  Free secure email account service provider with built-in end-to-end encryption. Free 1GB storage.
   * [QuickEmailVerification](https://quickemailverification.com) — Verify 100 emails daily for free on a free tier along with other free APIs like DEA Detector, DNS Lookup, SPF Detector and more.
   * [Sender](https://www.sender.net) Up to 15 000 emails/month - Up to 2 500 subscribers
   * [sendgrid.com](https://sendgrid.com/) — 100 emails/day and 2,000 contacts free
@@ -827,6 +828,7 @@ Table of Contents
   * [temp-mail.io](https://temp-mail.io) — Free disposable temporary email service with multiple emails at once and forwarding
   * [tinyletter.com](https://tinyletter.com/) — 5,000 subscribers/month free
   * [trashmail.com](https://www.trashmail.com) - Free disposable email addresses with forwarding and automatic address expiration
+  * [Tutanota](https://tutanota.com/) - Free secure email account service provider with built-in end-to-end encryption, no ads, no tracking. Free 1GB storage. Which also partially [open source](https://github.com/tutao/tutanota), so you can opt to self-host.
   * [Validator.Pizza](https://www.validator.pizza/) — Free API to detect disposable emails
   * [Verifalia](https://verifalia.com/email-verification-api) — Real-time email verification API with mailbox confirmation and disposable email address detector; 25 free email verifications/day.
   * [verimail.io](https://verimail.io/) — Bulk and API email verification service. 100 free verifications/month