RFC 539 · UNKNOWN · 1973
SUN · 14 JUN 2026
Thoughts on the mail protocol proposed in RFC 524
Overview
RFC 539, “Thoughts on the mail protocol proposed in RFC 524”, is an Unknown document published in July 1973 by D. Crocker, J. Postel. 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 539 is hosted at rfc-editor.org. Available in TXT,HTML.
Other RFCs from 1973
- RFC 538 Traffic statistics
- RFC 537 Announcement of NGG meeting July 16-17
- RFC 542 File Transfer Protocol
- RFC 535 Comments on File Access Protocol
- RFC 543 Network journal submission and delivery
- RFC 534 Lost message detection
- RFC 544 Locating on-line documentation at SRI-ARC
- RFC 533 Message-ID numbers