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bastcrystal - you need to put US postage on the front of your envelope as that tells the US Postal Service that you have paid for them to do their job. If you put Australian postage on the front it will be returned to you as each countries postage only works in that particular country.
If you want to include a Global forever stamp instead of the US $1 that I asked for - that is acceptable as I am simply trying to get postage to include in future swaps in which I participate.
I hope that this answers your question, if not, feel free to rephrase and ask again.