Survey of SMTP implementations, September 1983
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This RFC is a survey of implementation status. It does not specify an official protocol, but rather notes the status of implementation of aspects of a protocol. It is expected that the status of the hosts reported on will change. This information must be treated as a snapshot of the state of these implemetations.
For the definition of Status, see RFC 2026.
For the definition of Stream, see RFC 8729.