AWhat changed
Specified 1982 SMTP commands, transactions, replies, and relay semantics.
Scientific scope
The record is Postel's sole-author RFC 821. It does not absorb earlier ARPANET mail, later SMTP revisions, message-format standards, extensions, security mechanisms or every implementation.
Evidence
The linked sources identify this contribution and its scope. WRS has not independently reconstructed the scientific claims. The record is Postel's sole-author RFC 821. It does not absorb earlier ARPANET mail, later SMTP revisions, message-format standards, extensions, security mechanisms or every implementation.
Contributors
- Jonathan B. Postel · SCIENCE: Named source author of the scoped work; individual effort shares are not measured.
Provisional WRS assessment, edition 2026-10-16.1. Independent expert calibration is pending. This grade does not certify correctness or assign ownership.
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