email – the transmission of computer-based messages over telecommunication technology.
email marketing – the promotion of products or services via email.
ezine – an electronic magazine, whether delivered via a Web site or an email newsletter.
ezine directory – directory of electronic magazines, typically of the email variety.
HTML email – email that is formatted using Hypertext Markup Language, as opposed to plain text email.
opt-in email – email that is explicitly requested by the recipient.
pass-along rate – the percentage of people who pass on a message or file.
permission marketing – marketing centered around obtaining customer consent to receive information from a company.
sig file – a short block of text at the end of a message identifying the sender and providing additional information about them.
viral marketing – marketing phenomenon that facilitates and encourages people to pass along a marketing message.