Email Verifier
- Validate that an email address is valid using Java, ColdFusion, or PHP. The tool checks address syntax, dns mx records, and the mail server without sending an email.
- http://www.activsoftware.com/email/verify/

Mail Validator
- verifies email addresses are deliverable in a email list.
- http://www.mailvalidator.com

Bulk Email Verify Express
- Fast Professional Bulk Email Address and Mailing List Verify Management Software.
- http://www.email-tool.com/verify.html

Fast Email Verifier
- Checks a validity of e-mail addresses in databases, address books , spreadsheets or any other mailing lists. Nothing is sent to the recipient.
- http://www.lencom.com/verifier.html

FreshAddress.com - Email List Building, Correction and Updating
- Our e-mail appending, e-mail list cleaning and correction, and ECOA (e-mail change of address and updating) services help you build and update your e-mail list.
- http://www.freshaddress.com/biz