RFC 561 · UNKNOWN · 1973
MON · 15 JUN 2026
Standardizing Network Mail Headers
Overview
RFC 561, “Standardizing Network Mail Headers”, is an Unknown document published in September 1973 by A.K. Bhushan, K.T. Pogran, R.S. Tomlinson, J.E. White. It has since been updated by RFC 680. The canonical text is published by the RFC Editor.
What “Unknown” means
The standards-track status of this early RFC was never formally classified.
Read this RFC
The canonical text of RFC 561 is hosted at rfc-editor.org. Available in TXT,HTML.
Relationships to other RFCs
Other RFCs from 1973
- RFC 560 Remote Controlled Transmission and Echoing Telnet option
- RFC 562 Modifications to the TELNET Specification
- RFC 559 Comments on The New Telnet Protocol and its Implementation
- RFC 563 Comments on the RCTE Telnet option
- RFC 557 REVELATIONS IN NETWORK HOST MEASUREMENTS
- RFC 565 Storing network survey data at the datacomputer
- RFC 556 Traffic Statistics
- RFC 566 Traffic statistics