EmailChange.com
Change of email address search engine and registry.

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.

Find Email Addresses
Directory of places that allow you look up E-mail addresses

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.

AOL E-Mail Finder
Locate email addresses of people throughout the United States.

College and University E-Mail
Search entries in the College E-Mail FAQ database, which describes how to find people's electronic mail addresses at universities around the world.

Find mE-Mail
Search engine connecting old e-mail addresses to new ones. Invites registration of new e-mail addresses.

EmailFinder and URLFinder
Linka old e-mail and web addresses with current information.

MailLocate.com
Database of new email addresses that match with old ones. Includes anti-spam protection.

Email Addresses
Consolidated people search for email, phone, area and postal codes.

Bigfoot Directories
Interactive search of e-mail directory listings.

InfoSpace Email Search
Worldwide email directory.