What is the best way to send and receive QSL cards? Is it okay to send out a card by just putting a stamp on it and dropping it the mailbox? I have been sending mine out this way, but most reply cards I get are sent in envelopes. It costs a lot more money to send them that way, so why do most people do it like that?
Also, now that I am working DX, what is the best way to handle cards to foreign countries?
Thanks for your help!