From my perspective, if I "reject" anyone, it is usually because they have no-showed in the past or keep perpetually inquiring and not book, or they ask for bbfs, or they are rude… I do tell them they are blacklisted, if they want to get off the blacklist, they have to either pay a deposit or a cancellation fee via etransfer, and that will put them in my good books again. There are times when I get emails but cannot reply to them, or the person phones me once, with no text to follow up… Always contact the sp via their 1st preferred method, if you do not receive a reply, try another method or use a different email account… Cheers and Good luck!