Offhand, I don't think I've ever mailed an International letter or package.

Is return postage something that, normally, my local post office would help me with? E.G. do they have some method of marking or adding post to a package that would be accepted globally (or at least within the destination country)?

That's the International Reply Coupon mentioned in the article, but it's not supported by all countries.

I think I've sent far more international letters and parcels than domestic. Christmas cards for elderly relatives in the country I was born in, and postcards when I travelled abroad.

Some obscure things I sold on eBay were mostly sent abroad.

I send $3 U.S. with QSL (ham radio) cards. It seems like everybody is able to convert that to local currency to cover postage.

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