Outlook Email Verifier 

From time to time users do change their e-mail addresses due to some reasons (lost password, SPAM flows, etc). Therefore it is a good idea to validate the email addresses in your Address Book and mailboxes periodically. Try Email Verifer for FREE.
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BulkVerifier 

BulkVerifier is an efficient multi-threaded application for checking e-mail addresses and domain availability. Quickly and easily verifies email addresses, huge domains and clean up your mailing / domain list.
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Hotmailer 

Hotmailer is a bulk email sender, email address finder and verifier. It can efficiently search large amount of e-mail addresses from a mail server in a short time. With built in SMTP server, it will connect to the remote server and post email address
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Advanced Maillist Verify 

AMV determines which of addresses in mailing list are dead. The program supports databases (ODBC SQL), TheBat, Eudora and Windows address books, Socks5 proxy protocol. Has open ActiveX/COM and CGI/ISAPI interfaces for developers.
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