NodemailTest.fs

  let config = jsOptions<Nodemail.Config>(fun opt -> 
    opt.auth <- {user=someUser;pass=password}
    opt.port <- 465
    opt.host <- host
    opt.secure <- true
    opt.debug <- true
  )

  let message= jsOptions<Nodemail.Message>( fun msg -> 
    msg.subject <- title
    msg.text <- text
    msg.``to`` <- recipient
    msg.from <- from
    msg.cc <- Some cc
  )
  let transport = Nodemail.nodemail.createTransport config
  promise {
    let! response = transport.sendMail message
    return 
      if isNull response?messageId then 
        Error (unbox response) 
      else 
        let infos : Nodemail.Info = unbox response
        Ok infos
  }