I forgot to attach stamps. What will happen to my letter?

You wrote the return address on the envelope: the letter will be returned to you.

You did not write a return address: the postman will ask the recipient to pay the shipping. Not in cash, but in the form of the missing stamp(s) on a yellow postage card. The recipient must mail that card. When bpost receives the postage card, your letter or card will be delivered to the recipient.

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