Extended Simple Mail Transfer Protocol
E947921
Extended Simple Mail Transfer Protocol (ESMTP) is an enhancement of the original SMTP standard that adds support for additional features such as authentication, enhanced status codes, and larger message sizes to improve email transmission capabilities.
All labels observed (7)
| Label | Occurrences |
|---|---|
| ESMTP | 4 |
| Extended Simple Mail Transfer Protocol canonical | 3 |
| ESMTP SIZE extension | 1 |
| ESMTP extension model | 1 |
| Extended SMTP | 1 |
| SIZE SMTP extension | 1 |
| SMTP Service Extension for Message Size Declaration | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T11801120 — 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: Extended Simple Mail Transfer Protocol Context triple: [RFC 1869, defines, Extended Simple Mail Transfer Protocol]
-
A.
Multipurpose Internet Mail Extensions
Multipurpose Internet Mail Extensions (MIME) is an Internet standard that extends the format of email to support text in character sets beyond ASCII as well as attachments like images, audio, video, and application files.
-
B.
SMTP Service Extension for Secure SMTP over Transport Layer Security
SMTP Service Extension for Secure SMTP over Transport Layer Security is an IETF standard (RFC 3207) that defines how to use TLS to provide encryption and secure authentication for SMTP email transmissions.
-
C.
RFC 5321
RFC 5321 is the Internet standard that specifies the Simple Mail Transfer Protocol (SMTP) used for email transmission across IP networks.
-
D.
IETF ESMTP Working Group
The IETF ESMTP Working Group was a standards body team within the Internet Engineering Task Force responsible for developing and extending the Extended Simple Mail Transfer Protocol used for modern email transmission.
-
E.
Standard for the Format of ARPA Internet Text Messages
Standard for the Format of ARPA Internet Text Messages is the seminal specification that defined the syntax and structure of electronic mail messages on the early ARPANET, forming the basis for modern Internet email formats.
- 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: Extended Simple Mail Transfer Protocol Target entity description: Extended Simple Mail Transfer Protocol (ESMTP) is an enhancement of the original SMTP standard that adds support for additional features such as authentication, enhanced status codes, and larger message sizes to improve email transmission capabilities.
-
A.
Multipurpose Internet Mail Extensions
Multipurpose Internet Mail Extensions (MIME) is an Internet standard that extends the format of email to support text in character sets beyond ASCII as well as attachments like images, audio, video, and application files.
-
B.
SMTP Service Extension for Secure SMTP over Transport Layer Security
SMTP Service Extension for Secure SMTP over Transport Layer Security is an IETF standard (RFC 3207) that defines how to use TLS to provide encryption and secure authentication for SMTP email transmissions.
-
C.
RFC 5321
RFC 5321 is the Internet standard that specifies the Simple Mail Transfer Protocol (SMTP) used for email transmission across IP networks.
-
D.
IETF ESMTP Working Group
The IETF ESMTP Working Group was a standards body team within the Internet Engineering Task Force responsible for developing and extending the Extended Simple Mail Transfer Protocol used for modern email transmission.
-
E.
Standard for the Format of ARPA Internet Text Messages
Standard for the Format of ARPA Internet Text Messages is the seminal specification that defined the syntax and structure of electronic mail messages on the early ARPANET, forming the basis for modern Internet email formats.
- F. None of above. chosen
Statements (39)
| Predicate | Object |
|---|---|
| instanceOf |
email transfer protocol
ⓘ
network protocol ⓘ |
| abbreviation | ESMTP ⓘ |
| allows |
advertising server capabilities
ⓘ
negotiating supported extensions ⓘ |
| backwardsCompatibleWith | SMTP ⓘ |
| basedOn | SMTP ⓘ |
| commandIntroduced |
EHLO
ⓘ
linked to:
SMTP
|
| commandReplaces | HELO ⓘ |
| defaultPort |
25
ⓘ
587 ⓘ |
| definedIn | RFC 1869 ⓘ |
| enables |
client authentication
ⓘ
internationalization of email addresses ⓘ larger message sizes ⓘ secure transport via STARTTLS ⓘ |
| extends |
Simple Mail Transfer Protocol
ⓘ
linked to:
SMTP
|
| improves | email transmission capabilities ⓘ |
| layer | application layer ⓘ |
| purpose | to extend SMTP with optional capabilities ⓘ |
| standardizedBy | Internet Engineering Task Force ⓘ |
| status | Internet Standard ⓘ |
| supportsFeature |
8BITMIME
ⓘ
BINARYMIME ⓘ CHUNKING ⓘ DSN ⓘ ETRN ⓘ PIPELINING ⓘ SIZE extension ⓘ SMTP service extensions ⓘ SMTPUTF8 ⓘ STARTTLS ⓘ authentication ⓘ enhanced status codes ⓘ extended SMTP commands ⓘ |
| usedFor |
message delivery
ⓘ
message relay ⓘ message submission ⓘ |
| usesTransportProtocol |
TCP
ⓘ
linked to:
Transmission Control 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: Extended Simple Mail Transfer Protocol Description of subject: Extended Simple Mail Transfer Protocol (ESMTP) is an enhancement of the original SMTP standard that adds support for additional features such as authentication, enhanced status codes, and larger message sizes to improve email transmission capabilities.
Referenced by (12)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: Extended Simple Mail Transfer Protocol
linked to: Extended Simple Mail Transfer Protocol
linked to: Extended Simple Mail Transfer Protocol
linked to: Extended Simple Mail Transfer Protocol
linked to: Extended Simple Mail Transfer Protocol