AOL E-Mail Finder
   Locate email addresses of people throughout the United States.
   http://site.aol.com/netfind/emailfinder.adp

Bigfoot Directories
   Interactive search of e-mail directory listings.
   http://search.bigfoot.com

EmailChange.com
   Change of email address search engine and registry.
   http://emailchange.com/

EmailFinder and URLFinder
   Linka old e-mail and web addresses with current information.
   http://www.emailfinder.com

Find mE-Mail
   Search engine connecting old e-mail addresses to new ones. Invites registration of new e-mail addresses.
   http://www.findmemail.com

Free Email Guide
   Guide to free email search engines and directories. Lists the features of each service.
   http://freemailguide.com/free_email_search_engines.html

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.
   http://freshaddress.com

InfoSpace Email Search
   Worldwide email directory.
   http://www.infospace.com/home/white-pages/email-search

MESA: Meta Email Search Agent
   For a given name it searches in parallel at (nearly) all available sources of email addresses on the Internet.
   http://mesa.rrzn.uni-hannover.de/

MailLocate.com
   Database of new email addresses that match with old ones. Includes anti-spam protection.
   http://www.maillocate.com/

TowerData
   Email data quality services for businesses: email append, email change of address (ECOA), and email list hygiene.
   http://www.towerdata.com