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It is tradition to start with. When things were all handled manually, it really didn't matter. But the creation of automated machines to handle and speed mail makes it important to place them in the right place. Otherwise they can will be rejected by the machine. Then it has to be handled by hand and it slows down delivery.

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13y ago
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13y ago

Business concerns often stamp incoming mail. Some post offices also stamp incoming mail, particularly those that are being tracked. This establishes that the item was received on a specific date. This type of documentation can have legal value in establishing delivery.

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15y ago

The delivery service will only deliver letters which the senders have paid to have delivered. Teh stamp is your receipt and shows that the letter is 'legitimate'.

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11y ago

The purpose of stamping envelopes is because each stamp is a payment for the letter to be mailed. It is a way for paying for the mail and post offices for delivering the mail.

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9y ago

To pay for the cost of delivering it.

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Q: Why do you have to put stamps on letters?
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