Simple Mail Transfer Protocol
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About
Simple Mail Transfer Protocol (SMTP) is the protocol almost universally used for handling outgoing email.
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Notes
Example session (Wikipedia also has one):
root@cloud1:~# telnet localhost 25 Trying 127.0.0.1... Connected to localhost. Escape character is '^]'. 220 cloud1.vbz.ovh ESMTP Postfix (Ubuntu) HELO florence 250 cloud1.vbz.ovh rcpt to:<test@hypertwins.org> 503 5.5.1 Error: need MAIL command MAIL FROM:<test@oslt.ovh> 250 2.1.0 Ok RCPT TO:<test@hypertwins.org> 250 2.1.5 Ok DATA 354 End data with <CR><LF>.<CR><LF> This is a test message. . 250 2.0.0 Ok: queued as 48DD8BED39 quit 221 2.0.0 Bye Connection closed by foreign host. root@cloud1:~#