+SMTP (Simple Mail Transfer Protocol) is the fundamental [protocol](/wiki/protocol) for sending electronic [mail](/wiki/mail) across the [Internet](/wiki/internet). It orchestrates the journey of messages from sender to receiver, a silent workhorse of digital communication.
+## See also
+- [Email](/wiki/email)
+- [TCP/IP](/wiki/tcp/ip)
+- [Internet](/wiki/internet)
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