S

schema

The data design of a system often represented as a complete set of properties on the system's objects, together with their possible values and rules for their interaction.

Simple Mail Transfer Protocol

See SMTP.

SMTP

(Simple Mail Transfer Protocol) An application layer Internet protocol defining a standard for electronic mail among clients having common access to a server for message storage. The SMTP standard is specified in the RFC 821 document, and the message format is included in the RFC 822 document.

SSL

(Secure Sockets Layer) A protocol that provides for encrypted communications on the Internet. SSL runs in a layer above TCP/IP and below HTTP, NNTP, and SMTP.

subpart

A body part in the message tree of a MIME message that is contained within another body part.