Keeping track

I need to use a system for keeping track of my exchanges. Suddenly, while writing this post, I wonder if I've responded to Rafak Dobrowolski's letter of a couple of weeks back. I was to send him 150 New Zealand stamps in exchange for the same number that he sent me from Poland. Rafak is also interested in stamps from Brunei, Timor, Myanmar, Taiwan and the Pacific Islands, so next time I'll see if I have duplicates from those places.

I've since learned that Rafak received the stamps I sent him, and that he likes them. There were floods in his part of the world which prevented him from replying earlier.