What is the function of Simple Mail Transfer Protocol?

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Tags

1. #using
2. #emails
3. #internet
4. #server
5. #electronic
6. #messages
7. #transmission
8. #across
9. #networks
10. #simple
11. #sending
12. #relaying
13. #email
14. #transfer
15. #functions
16. #typically
17. #protocol
18. #standard