Cited in: RFC 1651
5 RFCs mentioned in the text of RFC 1651 (SMTP Service Extensions)
| RFC | Title | Status | Date |
|---|---|---|---|
| 821 | Simple Mail Transfer Protocol | Internet Standard | August 1982 |
| 822 | STANDARD FOR THE FORMAT OF ARPA INTERNET TEXT MESSAGES | Internet Standard | August 1982 |
| 1123 | Requirements for Internet Hosts - Application and Support | Internet Standard | October 1989 |
| 1521 | MIME (Multipurpose Internet Mail Extensions) Part One: Mechanisms for Specifying and Describing the Format of Internet Message Bodies | Draft Standard | September 1993 |
| 1522 | MIME (Multipurpose Internet Mail Extensions) Part Two: Message Header Extensions for Non-ASCII Text | Draft Standard | September 1993 |