the most important thing is, post office will give you a barcode, you print it, and paste on your letter. than you can check where is your letter. and your friends, your costumer can also check the letter and no need to worry about miss-send.
it is cheap and post office can save alot form printing stamps.
and you can desing your own stamp. and you pay it by credit card or a bill from post office, just like your gas bill.
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