We have created a new project in Jira Service Management. It works fine and customer can create ticket and add comment through the portal. We didn't turn on the email support yet. Right now if customer reply to the email notification, it get lost and won't be added to the ticket as comment. We want to allow customer to reply to the email notification and it get added to the ticket as comment. But we don't want to allow customer to create new ticket by email. We want the customer to only create new ticket from the portal. Is this doable? If yes, how should we configure this? Thanks.