1The page tells you it went. A confirmation appears on this page, not a blank screen you have to guess at.
2It reaches a person. The message goes to the team who build the product, with your topic on it so it lands in the right hands.
3The reply comes to the address you gave. So it is worth checking that line before you send.
4If it cannot send, you are told so. The page says the message did not go and gives you an address to write to directly, rather than pretending it worked.