MailList King - From the developer: "MailList King is an application that allows you to use your e-mail software as a Mailing List Server. When run MailList King automatically scans your mail folder for relevant messages and process them, for e.g.: 'Subscribe Me', 'Remove Me', 'Subscribe john@email.com', 'Subscribe john@email.com MyMailList'. MailList King uses a database to maintain your mailing list and allows you to easily send messages to your mailing list (or a selection of your mailing list). "Other features: Can scan a specified mail folder and retrieve all e-mails addresses in the to, from cc field or message body, Can automatically process undeliverable ('bounced') messages and remove addresses after they have bounced a specified number of times, supports importing and exporting of lists."