Can used to describe either a computer that handles the transfer of data, eg a mail gateway would process emails coming in to a company, or can also mean a computer that converts data from one protocol to another.

Shortened form of Computer Geek. A Geek is someone with a great passion for computers and is often stereotypically socially inept.

A form of image file. Stands for Graphics interchange Format. Uses a lot less file size than the BMP format. See also JPG.

Stands for General Packet Radio Service, and allows you to transfer data over mobile 'phone networks. It works by sending data in 'packets' rather than a continuous stream.

Emails from person not on the Blacklist, nor the Whitelist. Emails from senders on the Greylist and can be requested to prove they are sending legitimate email.