This module simply adds a ticket number in the subject line of emails sent to customers. In FreeScout tickets, conversations and emails are the same thing.
In Gmail when a support agent sends a message to a customer first – everything works fine. But when a customer sends an email from Gmail to FreeScout, Gmail may preserve original customer’s subject line and not show to the customer a new subject from support agent reply. This Gmail’s behavior can’t be changed, other mail services should show ticket number normally.