How do you check if an email has been read?

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Tags

1. #receipt
2. #message
3. #communicate
4. #confirm
5. #there
6. #person
7. #urgent
8. #emails
9. #sparingly
10. #whether
11. #email
12. #reliable
13. #check
14. #method
15. #important
16. #would
17. #extra
18. #receipts