Alkalis's Email Encryption Certificate. Install the certificate in your Keychain from your email provider of your choice. You should receive an email with instructions. Why you need a secure certificate with Apple's Mail — Alkalis blog post Oct 19, 2023 — Why you need a secure certificate with Apple's Mail. A new SSL or TLS certificate is only a cryptographic “signature.” It's the digital “fingerprints” of the code and its signature, created by one of a handful of digital “signers” you choose (called a “CA”). The CA's code is encrypted to protect you if someone wants to intercept your communications to snoop on the data they're intercepting. You can use this to help protect your email encryption keys, if you want to, and prevent your own certificate and key from being snooped on at any point—even if the server or application you used to encrypt or decrypt your data has been compromised and has lost all of its keys. As such, all you need is an encrypted “certificate” and one of these digital signers to protect the digital signature. How do I send an encrypted email on macOS? Step 1: Sign out and then sign back in to your Mail account Sep 22, 2023 — How do I send an encrypted email on macOS? Step 1: Sign out and then sign back in to your Mail account. In the “Accounts” menu, choose “Sign Out.” You'll be notified that you will be signed out for the next time you access the “Accounts” menu. Sign back in, then select “Sign out.” You're done! Step 2: Install the Alkalis (SSL/TLS Digital Signing Certificate) Apple's Mac users have several choices when it comes to securing their email services: SSL certificates and TSL certificates. If you are not yet a Mac user, and you want to take advantage of SSL or TLS encryption in your email, the good news is that Apple offers a free SSL or TLS certificate. For free SSL/TLS certificates, you need to sign up for Alkalis to get a digital CA certificate. Then you can install and use a digital certificate on your Mac in order to encrypt and sign your mail. Step 3: Install Your Certificate With Keychains The “Keychains” menu allows you to create and manage your keychain in a number of customizable ways.