We have email handler to add reply from email to the ticket as comment. We have a case that a customer created a ticket in the portal. I replied to the ticket from email as agent, which got added to the ticket as comment. Then the customer got the notification about my response and replied from email too. But it failed and the log said "Signup is not currently available". Since the customer created the ticket in the portal, I suppose the customer was already signed up. In customer permission, we have selected access for "Anyone with an account on" our company. Any idea how to fix this? Thanks.