What is meant by email header?

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Tags

1. #client
2. #first
3. #subject
4. #addresses
5. #header
6. #stamp
7. #destination
8. #message
9. #route
10. #content
11. #sends
12. #generated
13. #definition
14. #identification
15. #beginning
16. #including
17. #servers
18. #program