SMTP AUTH

E34941
SMTP extension email authentication protocol extension

SMTP AUTH is an extension to the Simple Mail Transfer Protocol that enables client authentication to mail servers, helping prevent unauthorized use and spam.

Try in SPARQL Jump to: Surface forms Statements Referenced by

All labels observed (6)

Label Occurrences
SMTP AUTH canonical 3
SMTP Service Extension for Authentication 3
SMTP AUTH extension 1

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 SMTP ⓘ
surface form: Simple Mail Transfer Protocol
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 Internet Engineering Task Force ⓘ
surface form: IETF
status widely deployed on modern mail servers ⓘ
supportsMechanism CRAM-MD5 ⓘ
DIGEST-MD5 ⓘ
RPCSEC_GSS ⓘ
surface form: GSSAPI

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.

SMTP → supportsAuthentication → SMTP AUTH ⓘ
Hydra → supportsProtocol → SMTP AUTH ⓘ
RFC 4954 → title → SMTP AUTH ⓘ
this entity surface form: SMTP Service Extension for Authentication
RFC 4954 → defines → SMTP AUTH ⓘ
this entity surface form: SMTP Authentication
RFC 4954 → defines → SMTP AUTH ⓘ
this entity surface form: SMTP AUTH extension
RFC 4954 → abbreviation → SMTP AUTH ⓘ
RFC 1651 → title → SMTP AUTH ⓘ
this entity surface form: SMTP Service Extensions
RFC 2554 → title → SMTP AUTH ⓘ
this entity surface form: SMTP Service Extension for Authentication
RFC 2554 → defines → SMTP AUTH ⓘ
this entity surface form: SMTP Service Extension for Authentication
RFC 2554 → obsoletedBy → SMTP AUTH ⓘ
this entity surface form: SMTP Service Extension for Authentication (RFC 4954)