There must be at least one email account tied to the domain used for Smallsite Design.
Modern email security needs a real email account tied to the domain to send out emails. This ensures that the email does not come from a spoofed account. Also useful is an account that cannot be responded to, as it can be used to send out notifications that don't need responding to.
The noreply account fulfills these two requirements. The actual name does not have to be
noreply, but that helps to be clear about what it is. Once created, its ability to reply will be turned off.