Undeliverable
Spam Assault! Professional Edition
All new Spam Assault! 5.0 Professional Edition now AutoDeletes SPAM directly from your POP3 mail server. For any SPAM that gets through, send back "Undeliverable Mail" messages to the spammer. Block by Sender, Domain, Country, Recipient, etc. Many, many
F30 GSA Email Verifier v.2012
FREE THIRTY DAYS 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.
Mach5 PopMonger Regular v.3.5.3
PopMonger is a free but elegant tool to help you with mailing list management.