SMTP Service Extension for Secure SMTP over Transport Layer Security
E272699
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.
All labels observed (4)
| Label | Occurrences |
|---|---|
| SMTP Service Extension for Secure SMTP over TLS | 1 |
| SMTP Service Extension for Secure SMTP over Transport Layer Security canonical | 1 |
| SMTP over TLS | 1 |
| SMTPS | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T2512254 — 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 Service Extension for Secure SMTP over Transport Layer Security Context triple: [RFC 3207, title, SMTP Service Extension for Secure SMTP over Transport Layer Security]
-
A.
SMTP
SMTP (Simple Mail Transfer Protocol) is a standard communication protocol used for sending and routing email messages across IP networks.
-
B.
S/MIME
S/MIME is a widely used standard for secure email that provides encryption and digital signatures using public key cryptography.
-
C.
SMTP AUTH
SMTP AUTH is an extension to the Simple Mail Transfer Protocol that enables client authentication to mail servers, helping prevent unauthorized use and spam.
-
D.
SASL
SASL (Simple Authentication and Security Layer) is a framework for adding modular authentication and optional data security services to connection-based network protocols.
-
E.
RFC 5321
RFC 5321 is the Internet standard that specifies the Simple Mail Transfer Protocol (SMTP) used for email transmission across IP networks.
- 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 Service Extension for Secure SMTP over Transport Layer Security Target entity description: 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.
-
A.
SMTP
SMTP (Simple Mail Transfer Protocol) is a standard communication protocol used for sending and routing email messages across IP networks.
-
B.
S/MIME
S/MIME is a widely used standard for secure email that provides encryption and digital signatures using public key cryptography.
-
C.
SMTP AUTH
SMTP AUTH is an extension to the Simple Mail Transfer Protocol that enables client authentication to mail servers, helping prevent unauthorized use and spam.
-
D.
SASL
SASL (Simple Authentication and Security Layer) is a framework for adding modular authentication and optional data security services to connection-based network protocols.
-
E.
RFC 5321
RFC 5321 is the Internet standard that specifies the Simple Mail Transfer Protocol (SMTP) used for email transmission across IP networks.
- F. None of above. chosen
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
IETF standard
ⓘ
SMTP service extension ⓘ email security protocol specification ⓘ |
| appliesToProtocol |
SMTP
ⓘ
Simple Mail Transfer Protocol ⓘ
linked to:
SMTP
|
| area |
Applications
ⓘ
Security ⓘ |
| category | Application layer security ⓘ |
| definedIn | RFC 3207 ⓘ |
| defines | SMTP STARTTLS extension advertisement in EHLO response ⓘ |
| documentType |
RFC
ⓘ
linked to:
RFCs
|
| enables |
encrypted relay between SMTP servers
ⓘ
encrypted submission from clients to SMTP servers ⓘ |
| extends | SMTP ⓘ |
| hasAcronym | STARTTLS ⓘ |
| introducesCommand | STARTTLS ⓘ |
| layer | application layer over TCP/IP ⓘ |
| mechanism | upgrades plaintext SMTP connection to encrypted connection ⓘ |
| negotiates | TLS session over existing SMTP connection ⓘ |
| negotiationPhase | occurs after initial SMTP greeting ⓘ |
| objective | secure SMTP email transmissions over untrusted networks ⓘ |
| operatesOn |
TCP port 25
ⓘ
TCP port 587 ⓘ |
| provides |
confidentiality for email transmission
ⓘ
encryption for SMTP sessions ⓘ integrity protection for SMTP ⓘ secure authentication for SMTP clients and servers ⓘ |
| publishedBy |
IETF
ⓘ
linked to:
Internet Engineering Task Force
Internet Engineering Task Force ⓘ |
| relatedTo |
RFC 2821
ⓘ
RFC 5321 ⓘ RFC 821 ⓘ |
| requires | support for TLS in both client and server ⓘ |
| rfcNumber | 3207 ⓘ |
| securityProperty |
mitigates man-in-the-middle attacks when certificates are validated
ⓘ
prevents passive eavesdropping on SMTP traffic ⓘ |
| standardizedBy |
IETF Network Working Group
ⓘ
linked to:
Network Working Group
|
| status | Proposed Standard ⓘ |
| supersedesPractice | use of separate SMTPS port 465 for implicit TLS in many deployments ⓘ |
| supports |
client certificate authentication
ⓘ
opportunistic encryption ⓘ server authentication via certificates ⓘ |
| updates | SMTP security model ⓘ |
| usedBy |
email service providers
ⓘ
mail submission agents ⓘ mail transfer agents ⓘ |
| usesProtocol |
TLS
ⓘ
Transport Layer Security ⓘ
linked to:
TLS
|
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 Service Extension for Secure SMTP over Transport Layer Security Description of subject: 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.
Referenced by (4)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: SMTP Service Extension for Secure SMTP over Transport Layer Security
linked to: SMTP Service Extension for Secure SMTP over Transport Layer Security
linked to: SMTP Service Extension for Secure SMTP over Transport Layer Security