Spam mail? Seriously? That is your suggestion? You are kidding here, right?
No. I am not that simple that I forgot think ‘Ah, maybe it is in Spam’. I mean: come on!
Please, take this seriously because, if you look through the forums you will read the same problem on other threads.
A update or two ago from Rapid Cart Pro this started to happen: no confirmation mails generated sometimes.
Please RealMac: FIX this!! It costs me money and makes disappointed and unsatisfied clients on my webshop!