Somebody has tried several times to send me emails, and I never receive them. I think that the sender's ISP has managed to get on to a spam blacklist. Also I once enquired about accommodation availability at a pub in Cumbria. Several days I got a reply: "Re: [SPAM] Accommodation enquiry".
So it's just possible that he never got the emails in the first place. Or they got dumped in his spam (or bulk) folder and he didn't think to look there - in which case they would have been automatically deleted after about a week.