Is proof of postage tracked?

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Tags

1. #paying
2. #number
3. #reference
4. #tracked
5. #tracking
6. #avoids
7. #accept
8. #still
9. #attached
10. #certificate
11. #covers
12. #track
13. #items
14. #posting
15. #royal
16. #proof
17. #updated
18. #extra
19. #delivered
20. #online
21. #delivery
22. #standard
23. #fully
24. #there