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DOI: https://doi.org/10.17487/RFC8551
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This document defines Secure/Multipurpose Internet Mail Extensions(S/MIME) version 4.0. S/MIME provides a consistent way to send andreceive secure MIME data. Digital signatures provide authentication,message integrity, and non-repudiation with proof of origin.Encryption provides data confidentiality. Compression can be used toreduce data size. This document obsoletes RFC 5751.
For the definition ofStatus,seeRFC 2026.
For the definition ofStream, seeRFC 8729.