AI & the web
SMTP
Simple Mail Transfer Protocol: a protocol for sending and relaying email.
In everyday use
An email service sends outgoing messages through SMTP.
What to keep in mind
Acceptance by a server does not guarantee inbox placement.
Also searched as: Simple Mail Transfer Protocol
Further reading
Original explanation and example by Perspectism. Further reading may cover the wider subject, rather than this exact wording. Edition updated 7 October 2026.
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