SMTP AUTH
E34941
SMTP AUTH is an extension to the Simple Mail Transfer Protocol that enables client authentication to mail servers, helping prevent unauthorized use and spam.
All labels observed (6)
| Label | Occurrences |
|---|---|
| SMTP AUTH canonical | 3 |
| SMTP Service Extension for Authentication | 3 |
| SMTP AUTH extension | 1 |
| SMTP Authentication | 1 |
| SMTP Service Extension for Authentication (RFC 4954) | 1 |
| SMTP Service Extensions | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T270527 — 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 AUTH Context triple: [SMTP, supportsAuthentication, SMTP AUTH]
-
A.
SMTP
SMTP (Simple Mail Transfer Protocol) is a standard communication protocol used for sending and routing email messages across IP networks.
-
B.
STARTTLS
STARTTLS is a protocol command used to upgrade an existing unencrypted connection to a secure TLS-encrypted one, commonly in email and other text-based communication protocols.
-
C.
POP3
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.
-
D.
IMAP
IMAP (Internet Message Access Protocol) is a standard email protocol that allows clients to access and manage messages stored on a mail server while keeping them synchronized across multiple devices.
-
E.
SSH
SSH (Secure Shell) is a cryptographic network protocol used to securely access, manage, and transfer data between remote computers over unsecured 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 AUTH Target entity description: SMTP AUTH is an extension to the Simple Mail Transfer Protocol that enables client authentication to mail servers, helping prevent unauthorized use and spam.
-
A.
SMTP
SMTP (Simple Mail Transfer Protocol) is a standard communication protocol used for sending and routing email messages across IP networks.
-
B.
STARTTLS
STARTTLS is a protocol command used to upgrade an existing unencrypted connection to a secure TLS-encrypted one, commonly in email and other text-based communication protocols.
-
C.
POP3
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.
-
D.
IMAP
IMAP (Internet Message Access Protocol) is a standard email protocol that allows clients to access and manage messages stored on a mail server while keeping them synchronized across multiple devices.
-
E.
SSH
SSH (Secure Shell) is a cryptographic network protocol used to securely access, manage, and transfer data between remote computers over unsecured networks.
- F. None of above. chosen
Statements (45)
| Predicate | Object |
|---|---|
| instanceOf |
SMTP extension
ⓘ
email authentication protocol extension ⓘ |
| advertisedBy | ESMTP ⓘ |
| advertisedUsing | EHLO response ⓘ |
| canUse | Base64-encoded credentials ⓘ |
| category |
email security
ⓘ
internet standard ⓘ |
| compatibleWith |
IPv4
ⓘ
IPv6 ⓘ |
| definedIn | RFC 4954 ⓘ |
| extends |
Simple Mail Transfer Protocol
ⓘ
linked to:
SMTP
|
| fullName | Simple Mail Transfer Protocol Authentication ⓘ |
| introduced | late 1990s ⓘ |
| negotiates | authentication mechanism via AUTH parameter ⓘ |
| operatesAtLayer | application layer ⓘ |
| previouslyDefinedIn | RFC 2554 ⓘ |
| purpose |
authenticate email clients to mail servers
ⓘ
help reduce spam ⓘ prevent unauthorized use of mail servers ⓘ |
| recommendedToBeUsedWith | TLS encryption ⓘ |
| relatedTo |
ESMTP
ⓘ
STARTTLS ⓘ |
| requires |
client support for AUTH command
ⓘ
server support for AUTH command ⓘ |
| role |
controls relay access on SMTP servers
ⓘ
enables submission of email from authenticated users ⓘ |
| securityConsideration | credentials should not be sent in clear text without TLS ⓘ |
| specifiedAs | SMTP service extension ⓘ |
| standardizedBy |
IETF
ⓘ
linked to:
Internet Engineering Task Force
|
| status | widely deployed on modern mail servers ⓘ |
| supportsMechanism |
CRAM-MD5
ⓘ
DIGEST-MD5 ⓘ GSSAPI ⓘ
linked to:
RPCSEC_GSS
LOGIN ⓘ NTLM ⓘ PLAIN ⓘ XOAUTH2 ⓘ |
| usedFor |
outgoing mail submission
ⓘ
restricting open relays ⓘ |
| usedWith |
Mail Submission Agent
ⓘ
Mail Transfer Agent ⓘ Mail User Agent ⓘ |
| usesCommand | AUTH ⓘ |
| usesResponseCode |
235 for successful authentication
ⓘ
535 for authentication failure ⓘ |
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 AUTH Description of subject: SMTP AUTH is an extension to the Simple Mail Transfer Protocol that enables client authentication to mail servers, helping prevent unauthorized use and spam.
Referenced by (10)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: SMTP AUTH