(messages sent by the system operator to particular users delivered automatically at the beginning of an MTS session), and signon messages (messages sent by the system operator to all users delivered automatically before the start of an MTS session). Some notable features of $MESSAGESYSTEM include the ability: to send to individuals by signon ID or name, to groups of individuals by signon ID, project ID, or group name, or to the system operator; to send to a list stored in a file; to use the program *USERDIRECTORY to create and maintain a database of e-mail names for individuals and for groups including names and groups that include remote or network users; to recall/delete messages that hadn't already been read; to add or remove recipients to messages after they had been sent; to display a history of messages in an e-mail chain without the need to include the text from older messages in each new message; to set expiration and hold until dates and times for e-mail messages; to display the status of incoming and outgoing messages; to retrieve incoming and outgoing messages using a database model (incoming, outgoing, new, old/seen, to recipients, from recipients, message number, date sent, expiration date, ...); to permit a mailbox allowing uses by signon IDs other than the mailbox owner's; to automatically forward messages from one mailbox to another; to archive older messages, and send and receive messages using a subroutine interface in addition to commands. An application for the Apple Macintosh, InfoX (aka MacHost), was developed to provide a modern interface to the MTS Message System and *USERDIRECTORY. In 1984 MTS could be used to send and receive remote e-mail to and from over 300 sites around the world. The first ability to send and receive e-mail messages to and from users on remote systems (remote messages or network mail) was implemented in 1982 as part of the MAILNET project, a joint effort of 16 universities and EDUCOM (later EDUCAUSE) supported with funding from the Carnegie Corporation. MIT served as a relay hub between the MAILNET sites and as a gateway to CSNET, ARPANET, and BITNET. MTS at the University of Michigan used its connections to the Merit Network and through Merit to GTE's commercial X.25 network, Telenet (later SprintNet), to communicate with MIT. MTS at the University of Michigan served as a relay site for other sites on the UM campus and for