What is ""ไปรษณีย์ส่งกลับ"" in American English and how to say it?

Thai

ไปรษณีย์ส่งกลับ

ไปรษณีย์ส่งกลับ-returned mail.svg
American English

returned mail

Learn the word in this minigame:

Example sentences

American EnglishIt's returned mail because I wrote the wrong address on the envelope.

How To Say ""ไปรษณีย์ส่งกลับ"" In 45 Languages.