Source: MarketingTerms.com

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.