It probably has to do with how envelope format developed from formal letter format. With the return address at top left, and the address in the center but left-aligned, the top right is the best leftover area.
Before postage stamps, postage was hand-written by the postal clerk in the top left. It followed logically that postage stamps, which replaced this practice, should go in the same place.
Nowadays, due to this convention, mail-sorting machines at the post office specifically look for the stamp in the top-left corner to orient the letters right-side-up (so the zip code can be read, etc.). If there is no stamp detected in that spot (even by flipping, rotating, etc), the letter gets sent to a reject pile, which has to be manually examined.
Technically I don't believe it legally matters where you put the postage, but putting it in a different location makes the mail more difficult handle, and could slow it down. This is especially true with printed-postage and custom stamps, which need to be scanned by machine to be verified.
2007-01-05 16:47:20
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answer #2
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answered by romulusnr 5
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Until about 1890 people put them in either top corner. Now the upper right is customary, and automated machines are set up to only accept stamps located there.
2007-01-07 20:22:46
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answer #3
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answered by Maple 7
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