MESA: Meta Email Search Agent - For a given name it searches in parallel at (nearly) all available sources of email addresses on the Internet. Free Email Guide - Guide to free email search engines and directories. Lists the features of each service. TowerData - Email data quality services for businesses: email append, email change of address (ECOA), and email list hygiene. Find mE-Mail - Search engine connecting old e-mail addresses to new ones. Invites registration of new e-mail addresses. EmailFinder - Fee-based service. Search for email addresses in the United States using first and last name, or find who uses an email address. FreshAddress - A free change of email address directory where you can search by name or old email address. Email appending, ECOA and list hygiene services available for businesses.