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RFC 3463 - Enhanced Mail System Status Codes

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Enhanced Mail System Status Codes (RFC 3463, )

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RFC 3463: Enhanced Mail System Status Codes

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https://datatracker.ietf.org/doc/html/rfc3463

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IETF Datatracker

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This document defines a set of extended status codes for use within the mail system for delivery status reports, tracking, and improved diagnostics. In combination with other information provided in the Delivery Status Notification (DSN) delivery report, these codes facilitate media and language independent rendering of message delivery status. [STANDARDS-TRACK]

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