1)   e-Campaign 4.8.2
e-Campaign enables you to design rich HTML emails/newletters/ezines easily, and deliver personalized HTML emails to mail lists.

 2)   AFU Plugins 30214-1141
These scripts combine with Auto FollowUp. AFU allows people to subscribe to the autoresponder by email, but this collection contains a script that will actually answer an email! It will respond to email subscribe and unsubscribe requests.

 3)   Advanced Maillist Manager 1.0
Advanced Maillist Manager (AMM) is designed to process incoming messages that contain subscribe/unsubscribe/etc requests.

 4)   Mach5 PopMonger Free 2.0.11
Process your inbound email for confirmed opt-in list management, using simple yet powerful rules and tasks for sending auto replies, redirect messages. Automatically delete matched emails from your inbox, redirect the rest for you to read. Freeware.

 5)   GoMail Subscription Manager 1.0
Manage subscription or unsubscription by email subject. GoMail Subscription Manager works seemlessly within Microsoft Outlook2000/2002 as a toolbar. It lets you monitor the InBox for particular subject line and automatically save/remove the sender.

 6)   Lashback UnsubSafe Toolbar 3.1
UnsubSafe is a proactive and intelligent anti-spam technology that consults a centralized database of online e-mail marketers reputations to make sure your unsubscribe request will be honored.