SMTP Service Extension for 8bit-MIMEtransport

E805482

Internet standard SMTP extension email protocol specification

SMTP Service Extension for 8bit-MIMEtransport is an Internet standard that defines how SMTP can be extended to support the transmission of 8-bit MIME message bodies without requiring conversion to 7-bit format.

Try in SPARQL Jump to: Surface forms Disambiguation Statements Elicitation Referenced by

All labels observed (6)

Label	Occurrences
8BITMIME	1
SMTP Service Extension for 8-bit MIME transport	1
SMTP Service Extension for 8bit-MIMEtransport canonical	1
SMTP Service Extension for Message Size Declaration	1
SMTP Service Extensions	1
SMTP Service Extensions framework	1

How this entity was disambiguated

This entity first appeared as the object of triple T9548173 — 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 8bit-MIMEtransport
Context triple: [RFC 1652, title, SMTP Service Extension for 8bit-MIMEtransport]

A. SMTP Service Extension for Secure SMTP over Transport Layer Security
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.
B. SMTP
SMTP (Simple Mail Transfer Protocol) is a standard communication protocol used for sending and routing email messages across IP networks.
C. MIME
MIME (Multipurpose Internet Mail Extensions) is an internet standard that extends the format of email to support text in character sets beyond ASCII, as well as attachments like images, audio, video, and application files.
D. Courier MTA
Courier MTA is a modular, open-source mail transfer agent for Unix-like systems known for its integrated mail services and focus on reliability and scalability.
E. IETF ESMTP Working Group
The IETF ESMTP Working Group was a standards body team within the Internet Engineering Task Force responsible for developing and extending the Extended Simple Mail Transfer Protocol used for modern email transmission.
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 8bit-MIMEtransport
Target entity description: SMTP Service Extension for 8bit-MIMEtransport is an Internet standard that defines how SMTP can be extended to support the transmission of 8-bit MIME message bodies without requiring conversion to 7-bit format.

A. SMTP Service Extension for Secure SMTP over Transport Layer Security
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.
B. SMTP
SMTP (Simple Mail Transfer Protocol) is a standard communication protocol used for sending and routing email messages across IP networks.
C. MIME
MIME (Multipurpose Internet Mail Extensions) is an internet standard that extends the format of email to support text in character sets beyond ASCII, as well as attachments like images, audio, video, and application files.
D. Courier MTA
Courier MTA is a modular, open-source mail transfer agent for Unix-like systems known for its integrated mail services and focus on reliability and scalability.
E. IETF ESMTP Working Group
The IETF ESMTP Working Group was a standards body team within the Internet Engineering Task Force responsible for developing and extending the Extended Simple Mail Transfer Protocol used for modern email transmission.
F. None of above. chosen

Statements (43)

Predicate	Object
instanceOf	Internet standard ⓘ SMTP extension ⓘ email protocol specification ⓘ
appliesTo	message body ⓘ message content ⓘ
area	Internet messaging ⓘ email ⓘ
avoids	conversion of 8-bit data to 7-bit encodings such as quoted-printable ⓘ conversion of 8-bit data to base64 ⓘ
basedOn	ESMTP extension model ⓘ linked to: Extended Simple Mail Transfer Protocol
category	Standards Track ⓘ
compatibleWith	MIME content-transfer-encoding 8bit ⓘ
constraint	does not guarantee end-to-end 8-bit support beyond advertising hops ⓘ
definesBehaviorFor	clients when 8BITMIME is not advertised ⓘ servers that receive 8-bit data without advertising 8BITMIME ⓘ
definesKeyword	8BITMIME ⓘ
documentType	RFC ⓘ linked to: RFCs
doesNotChange	SMTP command set other than capability advertisement ⓘ SMTP envelope semantics ⓘ
extendsProtocol	SMTP ⓘ Simple Mail Transfer Protocol ⓘ linked to: SMTP
influenced	later SMTP extensions for internationalization ⓘ
intendedUse	Internet email transmission ⓘ
obsoletesRequirement	strict 7-bit message body limitation in SMTP ⓘ
primaryGoal	allow transmission of 8-bit MIME message bodies without conversion to 7-bit ⓘ
publishedBy	Internet Engineering Task Force ⓘ
relatedTo	MIME ⓘ Message Format for Internet Mail (RFC 822 / RFC 5322) ⓘ linked to: RFC 5322 Multipurpose Internet Mail Extensions ⓘ SMTP Service Extensions framework ⓘ linked to: SMTP Service Extension for 8bit-MIMEtransport
requires	8-bit clean transport path between SMTP peers ⓘ SMTP client detection of 8BITMIME support via EHLO ⓘ SMTP server advertisement of 8BITMIME capability ⓘ
shortName	8BITMIME extension ⓘ
specifies	maximum transparency for octets with the high bit set in message bodies ⓘ
standardizedIn	RFC 1652 ⓘ
standardizes	negotiation of 8-bit message body transport ⓘ use of 8BITMIME keyword in EHLO response ⓘ
status	Proposed Standard ⓘ
supports	8-bit MIME message bodies ⓘ 8-bit character data in message content ⓘ
usesCommand	EHLO ⓘ
yearIntroduced	1994 ⓘ

How these facts were elicited