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SMTP
Simple Mail Transfer Protocol is a TCP/IP protocol used in sending and receiving emails, usually used with one of POP3 or IMAP, allows users save messages in a server mailbox and download them from the server.
| First released | 1982 |
| Developed by | Ray Tomlinson, John Postel |
| Open-source | Not defined |
| Used by | Google, Microsoft, Apple |
