To help prevent others from reading your emails, Gmail automatically encrypts the email in transit using Transport Layer Security (TLS). In most cases, you can verify the security of your emails when:
- You compose a new message.
- You receive a message.
If you have a work or school account, additional encryption types may be supported. Learn about email encryption in Gmail.
Want to get more out of Google apps at work or school?Sign up for aGoogle Workspace trial at no charge.
Check if your message is encrypted
- On your computer, open Gmail.
- At the top left, click Compose.
- In the 'To', 'Cc' or 'Bcc' field, enter your recipient's email address.
- To the right of your recipient, hover over Message security
: - Message security: standard encryption – the message is encrypted with TLS.
- Message security: enhanced encryption – the message is encrypted with S/MIME.
- Message security: no encryption – the message isn't encrypted, or Gmail doesn't recognise the encryption type.
: Tip: If there are multiple users with various encryption levels, the icon shows the lowest encryption status.
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Optional: To change encryption settings, click Message security
View details.
View details.Check if a message that you receive is encrypted
- In Gmail, open a message.
- At the top, next to the recipient, click Show details .
- In the window, next to 'security', check the encryption type:
- Standard encryption (TLS)
- Enhanced encryption (S/MIME)
- [Sender name] did not encrypt this message
.What to do if an email isn't encrypted
- If you get a warning that your email isn't encrypted or there's a red lock icon , the recipient may be using an email service that doesn't support TLS or another encryption type supported by Gmail. Consider removing unencrypted addresses or deleting confidential information from the email before you send.
- If you receive an unencrypted email that contains sensitive content, let the sender know and ask them to contact their email service provider.
- If you use S/MIME, emails are encrypted in S/MIME whenever possible. To either sign or receive S/MIME-encrypted emails, you need to have a valid S/MIME certificate from a trusted source.
, the recipient may be using an email service that doesn't support TLS or another encryption type supported by Gmail. Consider removing unencrypted addresses or deleting confidential information from the email before you send.Why some emails might not be encrypted
For standard encryption to work, the email providers of both the sender and the recipient always have to use TLS.
The email doesn't support encryption
Some email providers send messages to Gmail addresses using TLS but can't receive encrypted messages.
If you reply to these messages, this icon could show up even though you're sending from Gmail.
The email is encrypted, but Gmail still says that it doesn't support encryption
Sometimes you'll get a 'No TLS' warning even if a message is protected by encryption, such as when:
- Encryption hasn't worked for a certain email provider in the past
- Gmail isn't directly sending the message. For example, this icon might show up if you've set up a custom domain name, such as name@yourdomain.com.
