What happens if mail is returned to sender?

Related questions

1. Does the USPS photograph all mail?
2. What is USPS dead mail?
3. Why is my mail being returned?
4. Who can intercept a USPS package?
5. How does USPS hold for pickup work?
6. How much is a PO box?
7. What do I do with USPS previous owner?
8. Can someone else pick up my mail at the post office?
9. Does USPS intercept work?
10. Can I put my mail on hold online?

Tags

1. #number
2. #sender
3. #pieces
4. #postage
5. #refusing
6. #ranging
7. #delivered
8. #according
9. #factors
10. #accept
11. #considered
12. #insufficient
13. #reason
14. #regardless
15. #states
16. #cannot
17. #addressed
18. #person
19. #nonmailable
20. #returned
21. #undeliverable