Check 100, 000 Email addresses

We need someone to check a database of 100,000 email addresses by sending a short email message to each one. The sole purpose is to ascertain if the email address is working or not. Successful bidders must be able to demonstrate; 1) They have done this type of work in the past. 2) They have the required software and systems to accomplish this task successfully. 3) They understand how to send us the messages that have bounced so that we can delete them from our database.