If you use the Gmail app on an iPhone or Android mobile, here's how to open your secure message.
The following screenshots are from an iPhone but the steps are the same for Android devices. Any differences are highlighted in the guide.
1. From the email you received, tap on 'Read my message':
2. Tap on 'Send Code', followed by 'Done' (on an iPhone) or the back arrow (Android) in the top left hand corner:
3. This takes you back to the email you received. Tap on the back arrow at the top left:
3. You'll be in your Gmail inbox. Wait for an email containing the 6 digit verification code and make a note of it:
4. Return to the secure email you received and tap on 'Read my message':
5. Enter the verification code you noted earlier and tap on 'Verify Code':
6. You'll be through to your message: