Is there a way to determine whether a station or operator still sends physical QSL cards, rather than only uploading some data online? (or doing nothing at all.)
If so, what is the current procedure for successfully requesting a QSL card? Do I mail something? A QSL card of my own, a polite letter, or something else? An envelope? How does one discover the proper mailing address for the contact station?
For International contacts, do I need to include cash for return postage; and if so, how do I reduce the chances it will be stolen en-route? How about PayPal or bitcoin (et.al.)? Do operators ever use DHL or other commercial/non-postal carriers to send or obtain physical QSL cards?
And lastly, under what circumstances should I mail my own QSL card? Only in response to a request? Or otherwise?