RFC 221 · UNKNOWN · 1971
MON · 15 JUN 2026
Mail Box Protocol: Version 2
Overview
RFC 221, “Mail Box Protocol: Version 2”, is an Unknown document published in August 1971 by R.W. Watson. It obsoletes RFC 196. It has been obsoleted by RFC 278 — 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 221 is hosted at rfc-editor.org. Available in TXT,HTML.
Relationships to other RFCs
Other RFCs from 1971
- RFC 222 Subject: System programmer's workshop
- RFC 219 User's View of the Datacomputer
- RFC 223 Network Information Center schedule for network users
- RFC 218 Changing the IMP status reporting facility
- RFC 224 Comments on Mailbox Protocol
- RFC 217 Specifications changes for OLS, RJE/RJOR, and SMFS
- RFC 225 Rand/UCSB network graphics experiment
- RFC 216 Telnet Access to UCSB's On-Line System