RFC 5321
E34940
RFC 5321 is the Internet standard that specifies the Simple Mail Transfer Protocol (SMTP) used for email transmission across IP networks.
Aliases (1)
- RFC 2821 ×3
Statements (56)
| Predicate | Object |
|---|---|
| instanceOf |
Internet standard
→
Request for Comments document → SMTP specification → |
| acronym |
SMTP
→
|
| appliesTo |
IP networks
→
Internet → |
| area |
Applications
→
|
| category |
Standards Track
→
|
| defines |
2xx success replies
→
4xx transient failure replies → 5xx permanent failure replies → SMTP reply code classes → rules for message submission vs relay distinction → trace information in Received header fields → |
| definesProtocol |
Simple Mail Transfer Protocol
→
|
| focusesOn |
email transmission
→
message transfer → |
| language |
English
→
|
| obsoletes |
RFC 1869
→
RFC 2821 → RFC 2822 in SMTP-related aspects → RFC 821 → RFC 974 → |
| port |
25
→
|
| protocolLayer |
application layer
→
|
| publishedBy |
IETF
→
Internet Engineering Task Force → |
| publishedInSeries |
Request for Comments
→
|
| relatedTo |
RFC 5322
→
email message format → |
| RFCNumber |
5321
→
|
| specifies |
DATA command
→
EHLO command → EXPN command semantics → HELO command → MAIL FROM command → NOOP command → QUIT command → RCPT TO command → RSET command → SMTP commands → SMTP envelope format → SMTP error codes → SMTP replies → SMTP session state machine → STARTTLS extension framework interaction → VRFY command semantics → forwarding and relaying rules → mail routing via MX records interaction → mailing list expansion behavior → requirements for SMTP clients → requirements for SMTP servers → |
| status |
Internet Standard
→
|
| title |
Simple Mail Transfer Protocol
→
|
| transportAssumption |
TCP
→
|
| updates |
SMTP protocol
→
|