Chasing previous debtors

He needn’t worry about opening the letters, they have been sent to his address and he’s opening them for good reason. I hope it stops soon, such a nuisance. Also tell him never to put anything with his name and address on into the recycling - shred it or obliterate it with black felt pen.

Germanshepherdsmum thank you...I'll tell him to check his credit record.
I had suggested phoning the senders up but he was wary of opening mail addressed to another person.

Contact the people who are sending the letters. I had a spate of letters from insurance companies addressed to Asian people at the house I had lived in for over 20 years. Insurance fraud using an address in a very low crime, therefore cheaper premiums, area. I phoned each insurer and eventually it ended. But it’s important to speak to the people concerned, not just return letters to sender which will simply make matters escalate until the bailiffs arrive.
And tell him to check his credit record as debts may have been entered against his address.