Email, Messaging, & Video Calls Email How to Use SSL With an Email Account in macOS Mail Add a degree of security to your Apple Mail messages by Heinz Tschabitscher Writer A former freelance contributor who has reviewed hundreds of email programs and services since 1997. our editorial process Heinz Tschabitscher Updated on May 13, 2020 PeopleImages / Getty Images Email Yahoo! Mail Gmail Tweet Share Email Email is notoriously insecure. Unless you use encryption, email messages travel around the world in plain text, meaning anyone who intercepts them can read their contents. There is a way to at least partially secure the connection from you to your mail server. It is the same technology that also secures e-commerce sites: SSL, or Secure Sockets Layer. If your mail provider supports it, you can configure macOS Mail to connect to the server using SSL, thereby encrypting and securing some of your communications. Use SSL With an Email Account in Apple Mail Here's how to enable SSL encryption for an email account in macOS Mail: Select Mail > Preferences from the menu bar in Apple Mail. Select the Accounts tab and highlight the desired email account. Select the Server Settings tab. Select Use TLS/SSL. This will automatically change the port used to connect to the mail server. Unless your internet service provider (ISP) gave you specific instructions concerning the port you should use, the default setting is fine. This option will not be available if your email provider does not support SSL. Select Save and close the Preferences tab. SSL can slightly reduce performance because all communication with the server will be encrypted. You may or may not notice a change in speed depending on how modern your Mac is and what kind of bandwidth you have to your email provider. SSL vs. Encrypted Email SSL encrypts the connection between your Mac and your email provider's server. This approach offers some degree of protection from people on your local network, as well as your ISP, from snooping on your email transmissions. However, SSL does not encrypt email messages; it only encrypts the communications channel between Apple Mail and your email provider's server. As such, the message is still unencrypted when it moves from your provider's server to its final destination. To fully protect the contents of your email from origin to destination, you will have to encrypt the message itself using an open-source technology like GPG or through the use of a third-party encryption certificate. Alternatively, make use of a free or paid secure email service, which not only encrypts your messages but also protects your privacy.