SMTP
E5622
SMTP (Simple Mail Transfer Protocol) is a standard communication protocol used for sending and routing email messages across IP networks.
All labels observed (8)
| Label | Occurrences |
|---|---|
| SMTP canonical | 53 |
| Simple Mail Transfer Protocol | 27 |
| ESMTP | 2 |
| Extended SMTP | 2 |
| Domino SMTP task | 1 |
| SMTP EXPN | 1 |
| SMTPS | 1 |
| Simple Mail Transfer Protocol (SMTP) | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T53952 — 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: SMTP Context triple: [TCP/IP, includesProtocol, SMTP]
-
A.
Gmail
Gmail is Google's widely used web-based email service known for its large storage capacity, powerful search, and integration with other Google products.
-
B.
MX
MX is the two-letter ISO 3166-1 alpha-2 country code that uniquely identifies Mexico in international standards and systems.
-
C.
AOL
AOL is a pioneering American internet and online services company best known for popularizing dial-up access and email in the 1990s and early 2000s.
-
D.
HTTP
HTTP (Hypertext Transfer Protocol) is the foundational application-layer protocol used for transmitting web pages and other resources across the World Wide Web.
-
E.
ET
ET is the time standard used on the east coast of North America, including major cities like New York and Toronto, switching between Eastern Standard Time (EST) and Eastern Daylight Time (EDT) seasonally.
- 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: SMTP Target entity description: SMTP (Simple Mail Transfer Protocol) is a standard communication protocol used for sending and routing email messages across IP networks.
-
A.
Gmail
Gmail is Google's widely used web-based email service known for its large storage capacity, powerful search, and integration with other Google products.
-
B.
MX
MX is the two-letter ISO 3166-1 alpha-2 country code that uniquely identifies Mexico in international standards and systems.
-
C.
AOL
AOL is a pioneering American internet and online services company best known for popularizing dial-up access and email in the 1990s and early 2000s.
-
D.
HTTP
HTTP (Hypertext Transfer Protocol) is the foundational application-layer protocol used for transmitting web pages and other resources across the World Wide Web.
-
E.
ET
ET is the time standard used on the east coast of North America, including major cities like New York and Toronto, switching between Eastern Standard Time (EST) and Eastern Daylight Time (EDT) seasonally.
- F. None of above. chosen
Statements (49)
| Predicate | Object |
|---|---|
| instanceOf |
Internet protocol
ⓘ
application layer protocol ⓘ |
| abbreviationOf |
SMTP
self-linksurface differs
ⓘ
surface form:
Simple Mail Transfer Protocol
|
| assumes | reliable transport ⓘ |
| commandExample |
DATA
ⓘ
EHLO ⓘ HELO ⓘ MAIL FROM ⓘ NOOP ⓘ QUIT ⓘ RCPT TO ⓘ RSET ⓘ VRFY ⓘ |
| communicatesBetween |
mail submission agents
ⓘ
mail transfer agents ⓘ mail user agents via submission servers ⓘ |
| defaultPort | 25 ⓘ |
| defaultSubmissionPort | 587 ⓘ |
| definedIn | RFC 5321 ⓘ |
| designedFor | inter-host email transfer ⓘ |
| extendedBy |
SMTP
self-linksurface differs
ⓘ
surface form:
ESMTP
|
| fullName |
SMTP
self-linksurface differs
ⓘ
surface form:
Simple Mail Transfer Protocol
|
| implicitTLSPort | 465 ⓘ |
| introduced | early 1980s ⓘ |
| layer | application layer ⓘ |
| operatesOn |
Transmission Control Protocol
ⓘ
surface form:
TCP
|
| originallyDefinedIn | RFC 821 ⓘ |
| predecessor |
RFC 5321
ⓘ
surface form:
RFC 2821
RFC 821 ⓘ |
| primaryUse |
relaying email
ⓘ
routing email ⓘ sending email ⓘ |
| relatedProtocol |
IMAP
ⓘ
POP3 ⓘ |
| roleInEmail |
message delivery between servers
ⓘ
message relay ⓘ message submission ⓘ |
| runsOver | IP networks ⓘ |
| standardizedBy |
Internet Engineering Task Force
ⓘ
surface form:
IETF
|
| statusCodeType | 3-digit reply codes ⓘ |
| supports |
multiple recipients per message
ⓘ
store-and-forward message transfer ⓘ |
| supportsAuthentication | SMTP AUTH ⓘ |
| supportsExtensionMechanism | ESMTP extensions ⓘ |
| supportsSecurity | STARTTLS ⓘ |
| updatedBy | RFC 5321 ⓘ |
| uses |
7-bit ASCII encoding
ⓘ
command-reply model ⓘ text-based commands ⓘ |
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: SMTP Description of subject: SMTP (Simple Mail Transfer Protocol) is a standard communication protocol used for sending and routing email messages across IP networks.
Referenced by (88)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Simple Mail Transfer Protocol
subject surface form:
Claris Emailer
this entity surface form:
Extended SMTP
this entity surface form:
Simple Mail Transfer Protocol
this entity surface form:
Simple Mail Transfer Protocol
this entity surface form:
Simple Mail Transfer Protocol
this entity surface form:
Simple Mail Transfer Protocol
this entity surface form:
Simple Mail Transfer Protocol
this entity surface form:
Simple Mail Transfer Protocol