| 1 |
tools.ietf.org/html/rfc1521
rfc1521MIME (Multipurpose Internet Mail Extensions) Part One: Mechanisms for Specifying and Describing the Format of Internet Message Bodies (RFC ) |
| 2 |
tools.ietf.org/html/rfc1524
rfc1524A User Agent Configuration Mechanism For Multimedia Mail Format Information (RFC ) |
| 3 |
tools.ietf.org/html/rfc1590
rfc1590Media Type Registration Procedure (RFC ) |