Xtreeme MailXpert - From the developer: "All-in-one e-mail solutions: mailing list server, e-mail forwarder, auto responder, opt-in mailer, and more in a single package. "MailXpert is a mail-processing application which, because of its architecture, can be easily tailored to perform various functions. Out-of-the-box it excels as a flexible and powerful mailing list server, auto responder and opt-in mailer complete with HTML and personalization support built-in. There are three built-in wizards to do just that: help you configure one of the three most-common e-mail services. It's really easy. There's no need to write a script, edit dozens of configuration files or read a bulky user's manual cover to cover. "What's new: support for HTML and plain-text customizable digests, user-defined headers and footers automatically added to each message based on the content, full HTML personalization support, virus protection, wireless device support, fully secure subscription process." Note: Registration costs $59. The unregistered version appends a short notice to each outgoing message.