"Live Email Verifier is a powerful email validation
application to verify your contacts and keep your
mailing lists clean. This utility cleans up your mailing
lists, Windows Address Book, Microsoft Outlook Contacts,
and external databases.
Email Verifier checks all email addresses from a mailing
list, text file, Excel, selected database, and removes
all invalid email addresses.
It is important to keep your mailing lists clean. List
hygiene will help you avoid sending out newsletters to
invalid addresses. Otherwise you'll get tons of bounced
messages. It's not a secret that ISP mail servers block
a sender's IP for recurring sending to invalid email