How to Access Secure Email 1.To open the email, click on the message.html. 2.Select Use a one-time passcode. You will be redirected to the secure email portal. 3.You will receive an email with a passcode from 365@messaging.microsoft.com. Open the email. 4.Once you have the passcode, go back to the message.html and enter the passcode into the appropriate field. 5.Click Continue to open the email. Please note: the passcode will expire in 15 minutes. 6.You can now view the secure email.