@Sarah3595 @Emiel1 You ca still use that coded email address, but you have to go to a special page where you "attest" that you'll only use it to send the guest certain information. I don't have the link to that page, but maybe do a a search, or I'll look for it later.
And Sarah, I've often just copied out the email address by hand (yes, I know it's long) and then written it in the "To" field of my email. (I just send them emails from my own email address). Or simply ask the guest for their real email address. No guest has ever balked at giving that to me, as I also give them mine and they know it's for the purpose of sending them a map.
Also you can now apparently add attachments to Airbnb messages.