Function smtpbis::smtp_server

pub async fn smtp_server<S, H>(
    socket: &mut S, 
    handler: &mut H, 
    config: &Config, 
    shutdown: &mut ShutdownSignal, 
    banner: bool
) -> Result<LoopExit<H>, ServerError> where
    S: AsyncRead + AsyncWrite + Unpin + Send,
    H: Handler,