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DOI: https://doi.org/10.17487/RFC6710
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This memo defines an extension to the SMTP (Simple Mail TransferProtocol) service whereby messages are given a label to indicatepreferential handling, to enable mail handling nodes to take thisinformation into account for onward processing. [STANDARDS-TRACK]
For the definition ofStatus,seeRFC 2026.
For the definition ofStream, seeRFC 8729.