How can I check if an email address exists?

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Tags

1. #connect
2. #exist
3. #message
4. #simulates
5. #enter
6. #really
7. #mailbox
8. #email
9. #whether
10. #records
11. #address
12. #extracts
13. #button
14. #check
15. #server
16. #tells
17. #sending