RFC 5321
E34940
RFC 5321 is the Internet standard that specifies the Simple Mail Transfer Protocol (SMTP) used for email transmission across IP networks.
All labels observed (2)
How this entity was disambiguated
This entity first appeared as the object of triple T270506 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: RFC 5321 Context triple: [SMTP, definedIn, RFC 5321]
-
A.
RFC 791
RFC 791 is the foundational Internet standard that specifies the design, structure, and operation of the Internet Protocol version 4 (IPv4).
-
B.
SMTP
SMTP (Simple Mail Transfer Protocol) is a standard communication protocol used for sending and routing email messages across IP networks.
-
C.
RFC 9113
RFC 9113 is the Internet standards document that specifies the HTTP/2 protocol, defining its framing, semantics, and operational behavior on the web.
-
D.
RFC 9114
RFC 9114 is the Internet standard that specifies HTTP/3, the version of the Hypertext Transfer Protocol that runs over the QUIC transport protocol.
-
E.
RFC 1035
RFC 1035 is an Internet standards document that defines the implementation details, message formats, and operational procedures for the Domain Name System (DNS).
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: RFC 5321 Target entity description: RFC 5321 is the Internet standard that specifies the Simple Mail Transfer Protocol (SMTP) used for email transmission across IP networks.
-
A.
RFC 791
RFC 791 is the foundational Internet standard that specifies the design, structure, and operation of the Internet Protocol version 4 (IPv4).
-
B.
SMTP
SMTP (Simple Mail Transfer Protocol) is a standard communication protocol used for sending and routing email messages across IP networks.
-
C.
RFC 9113
RFC 9113 is the Internet standards document that specifies the HTTP/2 protocol, defining its framing, semantics, and operational behavior on the web.
-
D.
RFC 9114
RFC 9114 is the Internet standard that specifies HTTP/3, the version of the Hypertext Transfer Protocol that runs over the QUIC transport protocol.
-
E.
RFC 1035
RFC 1035 is an Internet standards document that defines the implementation details, message formats, and operational procedures for the Domain Name System (DNS).
- F. None of above. chosen
Statements (56)
| Predicate | Object |
|---|---|
| instanceOf |
Internet standard
ⓘ
Request for Comments document ⓘ SMTP specification ⓘ |
| acronym | SMTP ⓘ |
| appliesTo |
IP networks
ⓘ
Internet ⓘ
linked to:
the internet
|
| area | Applications ⓘ |
| category | Standards Track ⓘ |
| defines |
2xx success replies
ⓘ
4xx transient failure replies ⓘ 5xx permanent failure replies ⓘ SMTP reply code classes ⓘ rules for message submission vs relay distinction ⓘ trace information in Received header fields ⓘ |
| definesProtocol |
Simple Mail Transfer Protocol
ⓘ
linked to:
SMTP
|
| focusesOn |
email transmission
ⓘ
message transfer ⓘ |
| language | English ⓘ |
| obsoletes |
RFC 1869
ⓘ
RFC 2821 ⓘ RFC 2822 in SMTP-related aspects ⓘ RFC 821 ⓘ RFC 974 ⓘ |
| port | 25 ⓘ |
| protocolLayer | application layer ⓘ |
| publishedBy |
IETF
ⓘ
linked to:
Internet Engineering Task Force
Internet Engineering Task Force ⓘ |
| publishedInSeries |
Request for Comments
ⓘ
linked to:
RFCs
|
| relatedTo |
RFC 5322
ⓘ
email message format ⓘ |
| RFCNumber | 5321 ⓘ |
| specifies |
DATA command
ⓘ
EHLO command ⓘ EXPN command semantics ⓘ HELO command ⓘ MAIL FROM command ⓘ NOOP command ⓘ QUIT command ⓘ RCPT TO command ⓘ RSET command ⓘ SMTP commands ⓘ SMTP envelope format ⓘ SMTP error codes ⓘ SMTP replies ⓘ SMTP session state machine ⓘ STARTTLS extension framework interaction ⓘ VRFY command semantics ⓘ forwarding and relaying rules ⓘ mail routing via MX records interaction ⓘ mailing list expansion behavior ⓘ requirements for SMTP clients ⓘ requirements for SMTP servers ⓘ |
| status | Internet Standard ⓘ |
| title |
Simple Mail Transfer Protocol
ⓘ
linked to:
SMTP
|
| transportAssumption |
TCP
ⓘ
linked to:
Transmission Control Protocol
|
| updates | SMTP protocol ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: RFC 5321 Description of subject: RFC 5321 is the Internet standard that specifies the Simple Mail Transfer Protocol (SMTP) used for email transmission across IP networks.
Referenced by (15)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: RFC 5321
linked to: RFC 5321
linked to: RFC 5321