UPDATE!: I have to admit that I was already hoping for this, because following an email confirmation of my Aasiaat Radio reception I also received a letter by mail. And indeed, Bo Mogensen, head of Kystradio in Greenland (operated by Tusass), was again so kind to send a physical letter as QSL NDB OZN-372 Prins Christians Sund Greenland. Wow!!! Click here for more details about the reception of the furtherst NDB I ever logged.
Thank you Bo for this service, it is so nice to get a QSL/picture of these remote locations!