how difficult it is to keep in touch

I am not feeling that well meanwhile I am in mz last day of trip in Budapest.
So, taking advantage of the silente house of our host and of her laptop, I am starting collecting e/mails from Casapeople, so that I can keep in touch with all of you.
Surpraisingly, is way more difficult of what I tought. E/mails are somehow hidden, and even more impossible to find are physical adress.
Well, I know we are all sort of nomads with no stable house anywhere, but... How can I send you lightfoot letters if nobody nowadays uses physical adress anymore?