There is several posts re international mailing in either June or july secret pal thread (I think it's in the June one) the only difference is the cost of mailing, it takes longer and the customs form but that's it. Gaijin lives in Japan joins the boom swaps and has no issues with mailing.
I hope she joins it will be fun :-)
I almost regret getting my done so fast I almost feel like I'm missing the fun hahaha