The contraction for electronic mail; being the transmission of messages over a communications network. E-mail is a version of post office or telegraphic messages sent computer-to-computer or terminal-to-terminal, as with interoffice mail. Used on both Local Area Networks (LAN) and larger communications networks, electronic mail enables users to send and receive text, voice, and graphics messages; and users can also forward mail, include "carbon" copies, request return receipts, edit contents, and attach files. Enriched or "rich e-mail" includes style attributes, such as fonts and colors, image or audio clips. Delivered messages are stored in electronic mailboxes assigned to users on the network, either to individual recipients or in broadcast form to larger groups, and can then be viewed, saved, or deleted by the recipient. The protocol indicator for internet message transmission is "mailto:". See emoticon, flame, spam, underline, UseNet, MIME, SMTP, POP, SLIP, URL; compare PaperNet.