PopMonger is a free but elegant tool to help you with mailing list management.
This very small program is easy to set up with any POP3, IMAP, or Microsoft Exchange Server (MAPI) mailbox, and runs in the background. It can check your mailbox and parse through messages looking for delivery failures, subscribe requests, and unsubscribe requests. When PopMonger finds a matching message it can add the sender's address to a list along with a date and a label indicating why the email was added for auditing purposes. You can optionally mark a message for deletion after processing, and leave unmatched email in your mailbox to check personally. As part of the free Mach5 Mailer suite, PopMonger can reply to an email with text from a file, or redirect the message to another mailbox.
Upgrade to a PopMonger Gold license and add multiple mailbox support. PopMonger Gold's scripting support enables you to parse incoming email for fields you define, and provides complete information about the inbound message to your VBScript, JScript, or PHP program. Give yourself total database integration for inbound email with PopMonger Gold.
Mach5 PopMonger Regular is Free. Mach5 PopMonger Gold is $39.95. Mail sending capability requires Mach5 Mailer Free. Multiple mailbox and Scripting requires a PopMonger Gold license. Supports Windows 2000, Windows XP, & Windows Vista. AdWare and SpyWare Free.