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The standard was set by the Universal Postal Union. This organization sets the standards for international mail. They determine the rules and regulations that allow you to mail a letter from one country to another.

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Q: Why are airmail envelopes blue and red?
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What is the most secure airmail envelopes?

There are various places where one can purchase the most secure airmail envelopes. For example, websites such as Debatin, Amazon, Querneys and Eham all sell and provide very secure airmail envelopes.


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