GSA Email Verifier verifies email addresses from mailing lists, Microsoft Outlook contacts, Windows address book and a lot of other formats to determine if they are still valid. The software allows you to clean up your contact and mailing lists by removing "bad" emails.
Additionally you probably want to remove all administrative addresses such as nospam@, orders@, support@, webmaster@ to which you don't want to send emails. This can be done either by the included search tool or by predefined rules which set an email automatically...
