AOL E-Mail Finder: Locate email addresses of people throughout the United States.
Bigfoot Directories: Interactive search of e-mail directory listings.
EmailChange.com: Change of email address search engine and registry.
EmailFinder and URLFinder: Linka old e-mail and web addresses with current information.
Find Email Addresses: Directory of places that allow you look up E-mail addresses
Find mE-Mail: Search engine connecting old e-mail addresses to new ones. Invites registration of new e-mail addresses.
Free Email Guide: Guide to free email search engines and directories. Lists the features of each service.
FreshAddress.com: 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.
InfoSpace Email Search: Worldwide email directory.
MailLocate.com: Database of new email addresses that match with old ones. Includes anti-spam protection.
MESA: Meta Email Search Agent: For a given name it searches in parallel at (nearly) all available sources of email addresses on the Internet.
TowerData: Email data quality services for businesses: email append, email change of address (ECOA), and email list hygiene.