I infer that you do not have a solicitor to represent you. If you had, you could direct that all correspondence be addressed to your solicitor, and you could forward all correspondence that you receive to him or her.
So long as the court takes the position that the claimant is represented by his solicitor, you should deal only with that solicitor. It might be good for your peace of mind not to open any emails received from the claimant. Mind you, if his solicitor does manage to come off record, you might have a problem. Perhaps you need a solicitor to act for you, and be a buffer.