RFC 2633 · PROPOSED STANDARD · 1999
WED · 29 JUL 2026
S/MIME Version 3 Message Specification
Overview
RFC 2633, “S/MIME Version 3 Message Specification”, is a Proposed Standard document published in June 1999 by B. Ramsdell. It has been obsoleted by RFC 3851 — refer to the newer document for the authoritative version. The canonical text is published by the RFC Editor.
Abstract
This document describes a protocol for adding cryptographic signature and encryption services to MIME data. [STANDARDS-TRACK]
What “Proposed Standard” means
An entry-level standards-track specification: stable, peer-reviewed and a solid basis for implementation, though it may still evolve before becoming an Internet Standard.
Read this RFC
The canonical text of RFC 2633 is hosted at rfc-editor.org. Available in TXT,HTML.
Relationships to other RFCs
Other RFCs from 1999
- RFC 2632 S/MIME Version 3 Certificate Handling
- RFC 2634 Enhanced Security Services for S/MIME
- RFC 2631 Diffie-Hellman Key Agreement Method
- RFC 2635 DON'T SPEW A Set of Guidelines for Mass Unsolicited Mailings and Postings
- RFC 2630 Cryptographic Message Syntax
- RFC 2636 Wireless Device Configuration via ACAP
- RFC 2629 Writing I-Ds and RFCs using XML
- RFC 2637 Point-to-Point Tunneling Protocol