Can an email address have two signs?

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Tags

1. #mailbox
2. #identifies
3. #consists
4. #format
5. #receive
6. #specific
7. #single
8. #configured
9. #local
10. #example
11. #email
12. #domain
13. #general
14. #addresses
15. #multiple
16. #parts
17. #address
18. #administrator
19. #symbol
20. #jsmith
21. #before