We use Sendboard and just recently it has changed where a customer replies to an existing card, if it is not in the same board where our emails come in from Sendboard, it creates a brand new card with a new reference number. We are having to merge the cards all the time even though the subject header etc is the same.
This did not use to be a problem.
I am not sure what setting has been changed to create this as we have not changed our automations etc.