Quoting Patrick STODDARD (WD9EWK/VA7EWK) who wrote on Mon 2015-04-13 at 09:44:
If someone doesn't want to deal with QSL cards, this is something that could be clearly noted on QRZ.com. In fact, that site now has yes/no questions for how QSLs are handled by stations - by mail, eQSL, or Logbook of the World. Using the biography section in your QRZ.com entry to clearly spell this out is also recommended to get the point across.
The last issue of the Veron (Dutch radio club) magazine had a mention that due to rising costs of QSL forwarding by the different QSL bureaus it's a good idea to publish a clear QSL policy. QRZ.com or other sites where you publish about yourself related to your callsign are a good place to mention your QSL policy.
Koos van den Hout PD4KH