Thirteen secure email process

Thirteen uses Microsoft to send secure emails, you may receive an email in this way if a member of staff wishes to apply additional security to an email communication with you.

How do I read an encrypted email message? (I'm using Outlook.com or Microsoft 365)

If you’re using Outlook.com or Microsoft 365 and are using the Outlook.com website, the Outlook mobile app, or the Mail app in Windows 10, you can read and reply to encrypted messages the same way you do with unencrypted messages.

If you're using Outlook for Windows, Outlook for Mac, or a third-party email app, you’ll receive an email message with instructions for how to read the encrypted message. You can gain access using your Microsoft account or your Microsoft 365 account.

How do I read an encrypted email message? (I'm not using Outlook.com or Microsoft 365)

You'll receive an email message as shown below with instructions for how to read the encrypted message. 

If the encrypted message was sent to a Google or Yahoo Mail account, you can authenticate using your Google or Yahoo account or by using a temporary passcode. If the message was sent to a different account (Comcast or AOL, for example) you can use a temporary passcode. The temporary passcode will be sent to you in email.

For any questions about the process, or if you are having difficulty opening a secure email, please call us on 0300 111 1000.