A-B Split:  Refers to a test situation in which a list is split into two piec . . .
Above The Fold:  The part of an email message or Web page that is visible without . . .
Accreditation-Based Systems:  Third-party whitelist programs that cert . . .
Acquisition Cost:  In email marketing, the cost to generate one lead, newsletter sub . . .
Ad Swap:  An exchange between two publishers in which each agrees to run th . . .
Affiliate:  A marketing partner that promotes your products or services under . . .
Affirmative Consent:  An active request by a reader or subscriber to receive advertisin . . .
Alert:  Email message that notifies subscribers of an event or special pr . . .
Application Program Interface (API):  How a program (application) accesses ano . . .
Application Service Provider (ASP):  Company that provides a Web-based servic . . .
Attachment:  A text, video, graphic, PDF or sound file that accompanies an ema . . .
Attachments:  These are files which you can send along with your email, for exa . . .
Authentication:  An automated process that verifies an email sender's identity. . . .
Autoresponder:  Automated email message-sending capability, such as a welcome mes . . .
Bayesian Filter:  An anti-spam program that evaluates header and content of incomin . . .
Blackhole:  Term describing what happens to email that is blocked without a b . . .
Blacklist:  A list developed by anyone receiving email, or processing email o . . .
Blacklist - Private:  A list of IP addresses believed to send spam, compiled by an ISP . . .
Blacklist - Public:  A list of IP addresses believed to send spam. Public blacklists a . . .
Block:  A refusal by an ISP or mail server not to forward your email mess . . .