Hi There,
We are using latest version 1.15 os ticket in the system. One of our clients has group e-mail which they generate ticket by logging into the OS Ticket customer portal. When the agent respond to the ticket, the client receives the notification and reply back from his mail address via outlook mail account. Even though ticket subject and external ID matches(since he directly replies to the response mail) system generates new tickets.
I have replicated the scenario and added screenshot in the attachment with the reply response template as well.
Please let me know whether is it something related with the template or coding?