Does any country REQUIRE you to use a certain stamp for mailing

Many of us who love beautiful stamps know that you can use a variety of stamps to add up to or exceed the current rate for sending a postcard. You are NOT required to use the basic International stamp that your country issues. This means, for example, that instead of using the Round Global USA stamp, US Postcrossers can use a variety of Forever or other stamps to add up to the current rate to send a postcard: $1.50. I know this to be true in the US, UK, Netherlands, Germany, and Austral

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When sending documents in the mail in the United States, under

Does any country REQUIRE you to use a certain stamp for mailing

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You wrote a postcard in another country (with a stamp) but you

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