To manage your notifications within Barracuda:
First, open an email from Barracuda and click on the "view in email gateway defense"
Sign in if prompted:
Once signed in, click settings:
Click Quarantine Notification:
Click on the blue tiles to "turn off" notifications for that time:
(so, if I wanted 2PM turned off I would click that all the way down):
Make sure you click SAVE!