Call reservations and ask for the hotel's email address. Just did that for Hong Kong JW <[email protected]> and Bangkok Marriott Resort <[email protected]> and it work very well and only took a quick call. I found that while the format for email addresses works sometimes, by and large it does not work for international locations. If you reside in the US, then for US locations just call the hotel unless you are still one of those that still has to pay for domestic long distance.