score:3
If Emirates does not have a publicly visible e-mail address and no contact form on their web page, they want to be contacted by phone.
So you should consider phoning them and asking them for a mail address. This also gives you the opportunity to check with them if they actually want a scan of your document (at this time), and this gives them the opportunity to give you an address of their department that deals with the type of request that you are having.