How do I exclude some domains to let traffic pass through uninspected?

Zyxel_Emily

You can configure an exclusion list to exclude matching sessions to destination servers. This traffic is not intercepted and is passed through uninspected.

CONFIGURATION > UTM Profile > SSL Inspection > Exclude List

Here is another simple way to add exclude list. You can also go to Monitor > UTM Statistics > SSL Inspection > Certificate Cache List, select an item and then click Add to Exclude List to automatically add an entry for existing SSL traffic to a destination server. The item will then appear on the Exclude List.