Hello, if you are using IRCs you will need to use more than one. You'll need to check the weight of the envelope, and then find out how much an IRC is worth in the country you're sending to.

Welcome! You are correct! On the envelope you are sending out you put your country's stamps and on the return envelope you use their country's stamps or IRCs. It is better to use a SASE rather than a SAE because it is just polite and you'll chances will be higher to get a reply. Some agencies will pay for postage but, I don't want to risk it. Hoped I helped and feel free to ask anymore questions!

okay so im new to this fanmail stuff, should i send my mail WITH my country's stamp( im from germany ).. and the return envelope with a IRC or U.S stamp? (im planning to send to U.S anyway) ( and should it be stamped already? or they will do it?..

please and thank you!