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Port 587
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Service
submission
Protocol
TCP
Description
The Simple Mail Transfer Protocol (SMTP) submission port (587) is used by mail clients to submit outgoing mail to a mail submission agent (RFC 6409). Requires authentication and is distinct from port 25 for MTA-to-MTA relay.
RFC
RFC 6409
—
Message Submission for Mail
Citations
IANA registry
SMTP Submission (Wikipedia)
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