Hi,
I've found that when the status of a ticket has been changed from 'New', any replies to the ticket from the Customer (i.e. replying to the Agent via email) are not added to the ticket correctly. Instead, a new ticket is created.
- Ticket "A" is created
- Agent changes the ticket status to 'open' and replies to the customer
- Customer replies through email
- A new ticket: "Re: [Website] A [Code]" is created from that email.
If the status is kept, or reset to, 'New', the replies are added to the original ticket correctly.
I've tested this with both a Gmail and a branded email address for the customer side. The Support inbox is a Gmail account.