RFC 2821
E210669
RFC 2821 is an earlier Internet standard that defined the Simple Mail Transfer Protocol (SMTP) for email transmission before being superseded by RFC 5321.
All labels observed (2)
| Label | Occurrences |
|---|---|
| RFC 2821 canonical | 4 |
| SMTP RFC 2821 | 1 |
Statements (49)
| Predicate | Object |
|---|---|
| instanceOf |
Internet standard
ⓘ
Request for Comments ⓘ SMTP specification ⓘ |
| area | Applications Area ⓘ |
| category | Standards Track ⓘ |
| defaultPort |
25
ⓘ
587 ⓘ |
| definesAbbreviation | SMTP ⓘ |
| definesCommand |
DATA
ⓘ
EHLO ⓘ EXPN ⓘ HELO ⓘ MAIL ⓘ NOOP ⓘ QUIT ⓘ RCPT ⓘ RSET ⓘ TURN ⓘ VRFY ⓘ |
| definesProtocol |
SMTP
ⓘ
surface form:
Simple Mail Transfer Protocol
|
| obsoletedBy | RFC 5321 ⓘ |
| obsoletes |
RFC 1651
ⓘ
RFC 1652 ⓘ RFC 1869 ⓘ RFC 1870 ⓘ RFC 2197 ⓘ RFC 821 ⓘ RFC 974 ⓘ |
| protocolLayer | application layer ⓘ |
| publishedBy |
Internet Engineering Task Force
ⓘ
surface form:
IETF
Internet Engineering Task Force ⓘ |
| relatedTo |
RFC 2822
ⓘ
RFC 5321 ⓘ |
| RFCNumber | 2821 ⓘ |
| specifies |
SMTP commands
ⓘ
SMTP envelope format ⓘ SMTP replies ⓘ SMTP session model ⓘ error handling for SMTP ⓘ forwarding and relaying rules ⓘ mail queueing behavior ⓘ mail routing via MX records ⓘ retry strategies for message delivery ⓘ use of domain names in SMTP ⓘ |
| standardizes | email transmission ⓘ |
| status | Obsoleted ⓘ |
| title |
SMTP
ⓘ
surface form:
Simple Mail Transfer Protocol
|
| transportProtocol | TCP ⓘ |
| updates | SMTP model from RFC 821 ⓘ |
Referenced by (5)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
SMTP RFC 2821