Title: RFC 4021: Registration of Mail and MIME Header Fields | RFC Editor
Open Graph Title: RFC 4021: Registration of Mail and MIME Header Fields | RFC Editor
Description: This document defines the initial IANA registration for permanent mail and MIME message header fields, per RFC 3864. [STANDARDS-TRACK]
Open Graph Description: This document defines the initial IANA registration for permanent mail and MIME message header fields, per RFC 3864. [STANDARDS-TRACK]
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Opengraph URL: https://www.rfc-editor.org/info/rfc4021/
Generator: Nuxt
Domain: www.rfc-editor.org
| og:image | https://www.rfc-editor.org/api/v1/meta-thumbnail/rfc4021.png |
| og:image:alt | RFC 4021: Registration of Mail and MIME Header Fields. This document defines the initial IANA registration for permanent mail and MIME message header fields, per RFC 3864. [STANDARDS-TRACK]. |
| og:image:type | image/png |
| og:image:width | 1200 |
| og:image:height | 630 |
| og:type | article |
| article:modified_time | 2005-03-18 |
| resource-timestamp:info-rfc4021 | 2026-07-18T03:32:32.387+00:00 |
| citation_author | J. Palme |
| citation_doi | 10.17487/RFC4021 |
| citation_publication_date | 2005/03/18 |
| citation_technical_report_number | rfc4021 |
| citation_title | Registration of Mail and MIME Header Fields |
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