What happens to mail after forwarding expired?

Related questions

1. What happens if mail is returned to sender?
2. Can USPS hold mail longer than 30 days?
3. Is there a fee to hold USPS mail?
4. What happens to dead letter mail?
5. How do I schedule a pickup from USPS?
6. Can you extend USPS mail forwarding?
7. Why is my mail being returned to sender USPS?
8. What do I do with USPS previous owner?
9. Why does USPS return to sender?
10. Can I receive mail at two addresses?

Tags

1. #after
2. #expired
3. #address
4. #expires
5. #sender
6. #eighteen
7. #addressed
8. #unless
9. #forwarding
10. #period
11. #authorized
12. #months
13. #returned
14. #should
15. #endorsement
16. #temporary
17. #forward