Is a plus sign valid in an email address?

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Tags

1. #answers
2. #filtering
3. #actually
4. #which
5. #delimiter
6. #gmail
7. #sites
8. #character
9. #however
10. #people
11. #aliases
12. #emails
13. #beware
14. #written
15. #block
16. #validators
17. #allowed
18. #tracking
19. #addresses
20. #poorly