From the developer: "Power E-Mailer is a complete e-marketing software for the management of newsletters and E-Mailing. It allows the automatic management of subscriptions/unsubscriptions (Opt-in/Opt-out), the composition and sending of customized messages, in plain text or HTML format, with or without attachment or image. You can also manage all your subscribers into directories, import directories from many basic formats of data (Access, Excel, CSV, Lotus, DBase, Paradox, Outlook Express Adress Book...) while being ensured of the non redundancy of email addresses. With its bulk email marketing application, you can manage hundreds or thousands of contacts into one or several directories. This software uses the standard smtp/pop transfert protocol, and all you need is an mail account. This professional software allows you to send customized messages to your customers. You have 17 fields per directory, 4 of which are customized fields."