Editorial review -
A process in which Online Advertiser listings are checked to ensure relevancy. Not all PPC Search Engines review listings.

E-mail bounce -
An e-mail that cannot be delivered to the mailbox provider and is sent back to the e-mail Service Provider that deployed it. A bounce is classified as either hard or soft. Hard bounces are the failed delivery of e-mail due to a permanent reason, such as a non-existent address. Soft bounces are the failed delivery of e-mail due to a temporary issue, such as a full inbox or an unavailable ISP server.

E-mail campaign -
An advertising campaign distributed via e-mail.

Email client -
The software that recipients use to read Email, such as Outlook Express or Lotus Notes.

E-Commerce -
The process of conducting commercial transactions on the Internet, consisting of buying and selling products or services and the transfer of funds in payment thereof, through digital communications.

Email domain -
The portion of the Email address to the right of the @ sign.

Email filter -
A software tool that categorizes, sorts or blocks incoming Email, based either on the sender, the Email header or message content. Filters may be applied at the recipient’s level, at the Email client, the ISP or a combination.

Email friendly name -
Aka Display Name, From name. The portion of the Email address that is displayed in most, though not all, Email readers in place of, or in addition to, the Email address.

Email harvesting -
Automated process in which a robot program searches Webpages or other Internet destinations for Email addresses. The program collects the addresses into a database, which frequently gets resold to spammers or unethical bulk mailers.

Email newsletter -
Content distributed to subscribers by Email, on a regular schedule. Content is seen as valued editorial in and of itself rather than primarily a commercial message with a sales offer. (See ezine).

Email prefix -
The portion of the Email address to the left of the @ sign.

Email vendor -
Another name for an Email broadcast service provider, a company that deploys bulk (volume) Email on behalf of its clients. Also Email service provider (ESP).

Embedding -
Posting photos or video content within social media that is hosted by another network, i.e. YouTube.

Encryption -
The scrambling of digital information so that it is unreadable without the use of digital keys.

Engagement -
A desired interaction by a user to a brand. This could be “likes” on a Facebook fan page, retweets of a tweet sent by a brand, comments on a blog, or time spent on a social game.

Event triggered Email -
Pre-programmed messages sent automatically based on an event such as a date or anniversary.

Expandable ads & banners -
Rich Media ads that can be enlarged to dimensions beyond the initial dimensions of the placement they fill on the Webpage. The user initiates expanding events, sometimes after the ad initially expands briefly on its own to catch the user’s attention. (See CUAP).

Expandable dimensions -
The secondary dimension of an expanding ad unit, after the ad is expanded( E.g. 728×360). Initial dimensions are fit to the dimension of the placement (E.g. 728 x 90). Then, either by auto-play or by user interaction, the ad unit expands to its secondary dimension.

Eyeballs -
Colloquial reference to the number of people who view, or “lay their eyes on,” a certain Online advertisement.

Ezine -
An Online magazine shares some features with a Blog and also with Online newspapers, but can usually be distinguished by its approach to editorial control.