SMTP

E5622
Internet protocol application layer protocol

SMTP (Simple Mail Transfer Protocol) is a standard communication protocol used for sending and routing email messages across IP networks.

Jump to: Surface forms Statements Referenced by

Observed surface forms (4)

Surface form Occurrences
Simple Mail Transfer Protocol 10
Domino SMTP task 1
ESMTP 1

Statements (49)

Predicate Object
instanceOf Internet protocol ⓘ
application layer protocol ⓘ
abbreviationOf SMTP self-linksurface differs ⓘ
surface form: Simple Mail Transfer Protocol
assumes reliable transport ⓘ
commandExample DATA ⓘ
EHLO ⓘ
HELO ⓘ
MAIL FROM ⓘ
NOOP ⓘ
QUIT ⓘ
RCPT TO ⓘ
RSET ⓘ
VRFY ⓘ
communicatesBetween mail submission agents ⓘ
mail transfer agents ⓘ
mail user agents via submission servers ⓘ
defaultPort 25 ⓘ
defaultSubmissionPort 587 ⓘ
definedIn RFC 5321 ⓘ
designedFor inter-host email transfer ⓘ
extendedBy SMTP self-linksurface differs ⓘ
surface form: ESMTP
fullName SMTP self-linksurface differs ⓘ
surface form: Simple Mail Transfer Protocol
implicitTLSPort 465 ⓘ
introduced early 1980s ⓘ
layer application layer ⓘ
operatesOn Transmission Control Protocol ⓘ
surface form: TCP
originallyDefinedIn RFC 821 ⓘ
predecessor RFC 5321 ⓘ
surface form: RFC 2821

RFC 821 ⓘ
primaryUse relaying email ⓘ
routing email ⓘ
sending email ⓘ
relatedProtocol IMAP ⓘ
POP3 ⓘ
roleInEmail message delivery between servers ⓘ
message relay ⓘ
message submission ⓘ
runsOver IP networks ⓘ
standardizedBy Internet Engineering Task Force ⓘ
surface form: IETF
statusCodeType 3-digit reply codes ⓘ
supports multiple recipients per message ⓘ
store-and-forward message transfer ⓘ
supportsAuthentication SMTP AUTH ⓘ
supportsExtensionMechanism ESMTP extensions ⓘ
supportsSecurity STARTTLS ⓘ
updatedBy RFC 5321 ⓘ
uses 7-bit ASCII encoding ⓘ
command-reply model ⓘ
text-based commands ⓘ

Referenced by (35)

Full triples — surface form annotated when it differs from this entity's canonical label.

SMTP → abbreviationOf → SMTP self-linksurface differs ⓘ
this entity surface form: Simple Mail Transfer Protocol
RFC 5321 → acronym → SMTP ⓘ
S/MIME → compatibleWith → SMTP ⓘ
this entity surface form: Simple Mail Transfer Protocol
STARTTLS → definedFor → SMTP ⓘ
RFCs → defines → SMTP ⓘ
subject surface form: RFC
this entity surface form: Simple Mail Transfer Protocol
RFC 821 → definesProtocol → SMTP ⓘ
this entity surface form: Simple Mail Transfer Protocol
SMTP → extendedBy → SMTP self-linksurface differs ⓘ
this entity surface form: ESMTP
SMTP AUTH → extends → SMTP ⓘ
this entity surface form: Simple Mail Transfer Protocol
SMTP → fullName → SMTP self-linksurface differs ⓘ
this entity surface form: Simple Mail Transfer Protocol
this entity surface form: Domino SMTP task
TCP/IP → includesProtocol → SMTP ⓘ
NNTP → influencedBy → SMTP ⓘ
this entity surface form: Simple Mail Transfer Protocol
RFC 3207 → protocol → SMTP ⓘ
this entity surface form: Simple Mail Transfer Protocol
RFC 821 → standardizes → SMTP ⓘ
NeXT Mail → supports → SMTP ⓘ
Gmail → supportsProtocol → SMTP ⓘ
subject surface form: Microsoft Outlook
RFC 5321 → title → SMTP ⓘ
this entity surface form: Simple Mail Transfer Protocol
RFC 821 → title → SMTP ⓘ
this entity surface form: Simple Mail Transfer Protocol
TLS → usedByProtocol → SMTP ⓘ
this entity surface form: SMTPS
STARTTLS → usedInProtocol → SMTP ⓘ