How do you handle letters without postage stamps on them in your country?你们国家是如何处理不贴邮票的信件的？ I forgot to stamp the letter.这封信我忘了贴邮票。The letter wasn't stamped.这封信没有贴邮票。Don't forget to put a stamp on.别忘了贴邮票。It's FREEPOST, so there's no need for a stamp.这是免费邮寄，不用贴邮票。