What is SMTP relay service?

Related questions

1. What is SMTP protocol and how it works?
2. Why is SMTP used?
3. What is mailgun used for?
4. What is the function of POP protocol?
5. Why pop3 is used?
6. What is SMTP relay usage?
7. What is the use of SMTP protocol?
8. What is the role of POP and IMAP?
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Tags

1. #resets
2. #often
3. #password
4. #deliver
5. #through
6. #newsletters
7. #automatic
8. #party
9. #email
10. #confirmations
11. #large
12. #batches
13. #relay
14. #service
15. #specializes
16. #transactional
17. #trusted
18. #routes
19. #sending
20. #delivery
21. #emails