I want to start sending out paper QSL cards from my home in the US to folks that have been nice enough to send them to me. Most of the cards I have received have been in envelopes. Thus, I will probably go this route. The cards are from many countries around the world. What kind of postage do I need to use for envelopes with cards inside going to other countries? Or is it better for me to take all the envelopes with cards to the post office and have them put the postage on for me? Finally, what about Cuba? I have gotten a couple of cards from Cuba. Can we send cards back to folks in Cuba? As you can see, I'm new to the paper QSL Card game and any advice would be appreciated.
PS. I'm already using eQSL for electronic cards.
If you mean outbound postage (i.e. what it costs you to send the card), the rate is $1.05 for a 1 oz letter. For return postage, usually you include 2USD inside the envelope. Some countries need 3USD but there aren't very many of those. Some can even return you a card for 1USD. Best to check qrz and see what their recommendation is. If there isn't one just send 2USD.
You can send mail to Cuba, no problem. I wouldn't send currency there as it is technically illegal. However, most Cubans I've worked have QSL managers, usually in Spain.