BounceBully is a free easy to use drag and drop interface for Outlook and OutlookExpress to bounce spam back to spammers. Also, see what country a spam message was sent from.

.NET SMTP / POP3 Email Component with S/MIME for signed and encrypted mail, attachments, HTML mail, Auto-Zip and Unzip attachments, XML import and export, SMTP authorization, Outlook integration, distribution lists, internationalized, mail-merge...

MailSweep allows you to browse your mailbox and view sender, subject, size, priority and header information prior to downloading messages from the server. MailSweep supports multiple accounts, and includes filter and scheduler features.