Email encryption in transit – Gmail Help

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S/MIME is used to supportenhanced encryption in transit, and automatically encrypts your outgoing emails if it can.

Note: These steps only work if you haveS/MIME enabled on your account.

When you're sending or receiving messages, you can see the level of encryption a message has. The color of the icon will change based on the level of encryption.

If you're writing a message and see the red lock icon, consider removing these addresses or deleting the confidential information. To see which address is unencrypted, click View Details.

If you received a message with the red lock icon and the message contained particularly sensitive content, let the sender know and they can contact their email service provider.

If the person youre emailing is using an email service that doesnt encrypt all messages using S/MIME or TLS, their emails might not be secure. However,messages are encrypted in S/MIME whenever possible.

For S/MIME to work, to either sign or receive S/MIME encrypted mail, a user must have a valid S/MIME cert from a trusted root.

S/MIME is a long standing protocol which allows encrypted and signed messages to be sent using standard mail delivery SMTP.

It uses public key cryptography to:

Note: A message can't be decrypted if the user's key isn't uploaded when the message is delivered. Learn more about uploading certificates.

Opportunistic TLS (STARTTLS) is a protocol that helps provide privacy between communicating applications and their users during email delivery. When a server and client communicate, TLS ensures that no third party can overhear or tamper with any messages.

For delivery TLS to work, the email delivery services of both the sender and the receiver always have to use TLS.

Learn more about TLS email encryption.

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