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Please refer here for any errata for this document. To submit a new errata report, go to the main errata page.
There currently is not a standard mechanism for the reporting of mail system errors except for the limited set offered by SMTP and the system specific text descriptions sent in mail messages. There is a pressing need for a rich machine readable status code for use in delivery status notifications [DSN]. This document proposes a new set of status codes for this purpose. [STANDARDS-TRACK]
For the definition of Stream, see RFC 4844.