RFC 780 · UNKNOWN · 1981 MON · 14 SEP 2026

Mail Transfer Protocol

By S. Sluizer, J. Postel · Published May 1981 · DOI 10.17487/RFC0780

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.

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Relationships to other RFCs
This RFC obsoletes
RFC 772
Obsoleted by
RFC 788
Other RFCs from 1981