Google flags suspicious messages and sends you a summary list every two days. From this summary, you may choose to have quarantined messages delivered to your inbox as usual. Messages left in quarantine are automatically deleted after 30 days.
More info regarding the quarantine summary can be found here:
Please direct your browsers to: https://email-quarantine.google.com/messagecenter. You will be prompted for the SAU email and password.
You may be redirected to login again at the Portal login page.
Once authenticated, the Message center will be displayed. Quarantines spam messages, previously delivered messages and deleted items are accessible.
Click the gear icon and select "Settings."
On the next screen, the option for whitelisting email addresses is available.
Google will be adding more functionality to the Message Center in the near future. If you experience trouble with any part of the Message Center, please use the "Send Feedback" button.
For more info regarding the Message Center: