Observed that for one specific ticket - replies coming in from the customer side were not being added to the existing ticket ID.
It appears that this is down to one of the (customer) email addresses in the recipient list containing/starting with a hash # character, e.g. #
email@customer.co.uk
Our ticket 'identifier' appears like ##nnnn##, which needs to be included in the Subject to add to an existing ticket.
I wouldn't really want to change our ticket identifier - as it's been in use for years.
Is there anything you can recommend?