There could be a number of reasons of why. The first is you just wrote a couple of sentences, or even in some cases – I had received emails without any message in the body. These emails will not be replied to. Next, I might not have received your email. Every computer (including email servers) get hiccups, and while unlikely – they could have a hiccup. Next, you sound like a scam artist. I am getting too old to play with a scam artist’s head, so I will likely not reply. If your message is a SPAM, I am not going to reply. Last, if I severed ties with you, I am not going to reply to future emails from you. These are likely the reasons I will not reply.