Some Observations on Implementations of the Post Office Protocol (POP3)
This memo provides information for the Internet community. This memo does not specify an Internet standard of any kind.
Informational, not a standard. Published for the record and carrying no standards weight. Worth knowing before citing it as a requirement.
Normative requirements
This document does not use the RFC 2119 keywords. It states its requirements in ordinary prose, which is why nothing is listed here rather than because nothing was found.