Simple Mail Transfer Protocol (SMTP)

Simple Mail Transfer Protocol (SMTP), answering our ubiquitous call to e-mail, uses a spooled, or queued, method of mail delivery. Once a message has been sent to a destination, the message is spooled to a device—usually a disk.

The server software at the destination posts a vigil, regularly checking
this queue for messages. When it detects them, it proceeds to deliver them to
their destination. SMTP is used to send mail; POP3 is used to receive mail.
Line Printer Daemon (LPD)
The Line Printer Daemon (LPD)
protocol is designed for printer sharing. The
LPD, along with the LPR (Line Printer) program, allows print jobs to be
spooled and sent to the network’s printers using TCP/IP.

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