well replying to unwanted requests is pretty hard.
but if that someone wrote u a email once ,he will write it again ,if u dont reply and when he does then tell him if u r interested or not.
its up to u to decide ,or just go to your profile and take ur email off
Welcome to MM & the wild world of internet dating. I too take the time to politely respond with a decline if they've taken the time to email, but many don't seem to respond at all. No response means no interest, but agree that it would be nice to at least know they received your email. Have seen many comments re replying, some say they've responded politely declining & then get a verbal backlash, others say by not replying you'll clearly get the message. I personally feel if they've taken the time to contact you, it's the courteous, mannerly thing to do to respond with a thanks but not interested reply. Don't know when manners went out of style, but it just seems to be the way it is online.
Do what feels right for you & good luck in your search.