POP3
E5623
POP3 (Post Office Protocol version 3) is a standard email protocol used by clients to retrieve messages from a remote mail server over a TCP/IP network, typically downloading them for local storage.
All labels observed (10)
| Label | Occurrences |
|---|---|
| POP3 canonical | 29 |
| Post Office Protocol version 3 | 9 |
| Post Office Protocol - Version 3 | 2 |
| POP3 Extension Mechanism | 1 |
| POP3 RFC 1939 | 1 |
| POP3 over TLS | 1 |
| POP3 servers | 1 |
| POP3S | 1 |
| Post Office Protocol | 1 |
| Post Office Protocol Version 3 (POP3) Support for UTF-8 | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T53953 — 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: POP3 Context triple: [TCP/IP, includesProtocol, POP3]
-
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.
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.
-
C.
United States Postal Service
The United States Postal Service is an independent agency of the U.S. federal government responsible for providing nationwide postal delivery and related mail services.
-
D.
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.
-
E.
UDP
UDP (User Datagram Protocol) is a lightweight, connectionless transport-layer protocol used on the Internet for fast, low-overhead data transmission without guaranteed delivery or ordering.
- 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: POP3 Target entity description: POP3 (Post Office Protocol version 3) is a standard email protocol used by clients to retrieve messages from a remote mail server over a TCP/IP network, typically downloading them for local storage.
-
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.
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.
-
C.
United States Postal Service
The United States Postal Service is an independent agency of the U.S. federal government responsible for providing nationwide postal delivery and related mail services.
-
D.
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.
-
E.
SIM
SIM is the commonly used abbreviation for the Science and Industry Museum in Manchester, a major UK museum dedicated to the history and impact of science, technology, and industry.
- F. None of above. chosen
Statements (47)
| Predicate | Object |
|---|---|
| instanceOf |
Internet standard
ⓘ
application layer protocol ⓘ email retrieval protocol ⓘ |
| abbreviationOf |
POP3
self-linksurface differs
ⓘ
surface form:
Post Office Protocol version 3
|
| alternativeTo |
IMAP
ⓘ
Webmail ⓘ |
| authenticationSupport | username and password ⓘ |
| canUse |
SSL
ⓘ
TLS ⓘ |
| category | email protocol ⓘ |
| commandSetType | text-based commands ⓘ |
| connectionModel | client-server ⓘ |
| dataFlowDirection | server-to-client message retrieval ⓘ |
| defaultPort | 110 ⓘ |
| defaultPortSecure | 995 ⓘ |
| definedIn | RFC 1939 ⓘ |
| designGoal | simple email retrieval ⓘ |
| doesNotSupport |
advanced server-side search
ⓘ
server-side folders ⓘ |
| fullName |
POP3
self-linksurface differs
ⓘ
surface form:
Post Office Protocol version 3
|
| layer | application layer ⓘ |
| mailboxModel | single mailbox per account ⓘ |
| messageHandling | download-and-delete model ⓘ |
| networkType | packet-switched ⓘ |
| operatesOver | TCP connection ⓘ |
| organization |
Internet Engineering Task Force
ⓘ
surface form:
IETF
|
| predecessor | POP2 ⓘ |
| primaryRole | mailbox access protocol ⓘ |
| purpose | retrieving email from a remote mail server ⓘ |
| responseFormat | line-oriented text ⓘ |
| runsOn | TCP/IP ⓘ |
| securityExtension | POP3S ⓘ |
| sessionType | stateful during connection ⓘ |
| standardizedBy |
Internet Engineering Task Force
ⓘ
surface form:
IETF
|
| status | standard ⓘ |
| supports |
mailbox locking
ⓘ
message deletion ⓘ message listing ⓘ message retrieval by number ⓘ offline email access ⓘ |
| transportReliability | reliable ⓘ |
| typicalUsage | download email for local storage ⓘ |
| usedBy |
email clients
ⓘ
mail user agents ⓘ |
| usesPort |
110
ⓘ
995 ⓘ |
| usesTransportProtocol |
Transmission Control Protocol
ⓘ
surface form:
TCP
|
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: POP3 Description of subject: POP3 (Post Office Protocol version 3) is a standard email protocol used by clients to retrieve messages from a remote mail server over a TCP/IP network, typically downloading them for local storage.
Referenced by (47)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Post Office Protocol version 3
this entity surface form:
Post Office Protocol version 3
this entity surface form:
Post Office Protocol version 3
this entity surface form:
POP3 over TLS
this entity surface form:
POP3 RFC 1939
subject surface form:
Thunderbird
this entity surface form:
Post Office Protocol version 3
this entity surface form:
Post Office Protocol Version 3 (POP3) Support for UTF-8
this entity surface form:
Post Office Protocol version 3
this entity surface form:
POP3 servers
this entity surface form:
Post Office Protocol version 3
this entity surface form:
Post Office Protocol version 3
this entity surface form:
POP3S