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Advanced Mac Mailer allows you to send out personalized bulk messages

Syncs SMS/MMS messages from Palm-based Treo smartphones to Mac.

Add cards in Address Book from selected Mail messages.

A plugin for Apple Mail that shows messages

It lets you send/receive messages instantly and participate in chats.

Automatically send e-mails, faxes or SMS text messages from FileMaker Server

Quickly send messages to your Adium contacts.

HTTP Client is a debugger tool for HTTP messages

Allow you to generate customized email messages for any group in Address Book.

Browse and backup your Entourage messages.