RFC 780 · UNKNOWN · 1981
MON · 27 JUL 2026
Mail Transfer Protocol
Overview
RFC 780, “Mail Transfer Protocol”, is an Unknown document published in May 1981 by S. Sluizer, J. Postel. It obsoletes RFC 772. It has been obsoleted by RFC 788 — refer to the newer document for the authoritative version. 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 780 is hosted at rfc-editor.org. Available in TXT,HTML.
Relationships to other RFCs
Other RFCs from 1981
- RFC 779 Telnet send-location option
- RFC 781 Specification of the Internet Protocol timestamp option
- RFC 778 DCNET Internet Clock Service
- RFC 782 Virtual Terminal management model
- RFC 777 Internet Control Message Protocol
- RFC 783 TFTP Protocol
- RFC 776 Assigned numbers
- RFC 784 Mail Transfer Protocol: ISI TOPS20 implementation