You can offer your clients the ability to send HTML mails based on a template (either on your machine or at a URL), each personalized with the recipient's name. You can add attachments to everyone, or a group of people, there's progress bars while you're sending them - all this in an external PHP include file, so just a couple of lines on your page.
This extension uses old Server Behaviors technology deprecated by Adobe and we will also deprecate it soon. Please use the new DMXzone Mailer, based on the new DMXzone Server Connect technology for building dynamic web sites with server connectivity.