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

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

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.cfdev.com/email/verify/

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

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