There are two separate Editions of Xtreeme MailXpert: Standard and Professional. MailXpert Standard Edition is directed towards less-demanding users and is generally easier to install and configure. Professional Edition contains many additional advanced features and is directed towards professionals and enterprises who need enhanced reliability and sophistication it has been designed to offer.

Here's a list of some features of the application:

• Three built-in wizards let you create a discussion forum, an auto responder or a news board without hassle by answering a couple of questions,
• Personalize messages to your users (including HTML emails), e.g. "Dear John" instead of "Dear Customer",
• Use either built-in Publish Wizard or your favorite software to compose messages to your customers; you can use the email client you're most comfortable with,
• Import your existing subscribers database from an external file so you don't have to type in your customers database manually,
• Due to the architecture based on message rules, you can easily fine-tune the generated mailing lists to suit your particular needs or create new types of email services from scratch,
• Set up the server to run when it suits you using the flexible scheduling options; it may automatically connect to the Internet and hang up after it's done,
• Customizable HTML and plain-text digests available at a single mouse click,
• Secure subscription process offers security for your users,
• User-defined custom fields for each email service let you include in your messages frequently used text fragments,
• Use user-defined headers and footers automatically added to each message based on the content to add banners, advertisements and usage instructions,
• Create HTML newsletters or simply take advantage of full HTML support to impress your users,
• Have MailXpert automatically strip binary attachments from forwarded messages to protect your users from viruses,
• Wireless device support; forward incoming messages to your mobile while you're out of office,
• Multi-language support via completely customizable email messages,
• SMTP authentication,
• Ability to run as NT service (can keep working even when no user is logged in), *
• Support for regular expressions in message matching criteria,
• Up to 64 custom fields per subscriber record, *
• Text extraction from incoming emails, *
• Advanced closed loop detection, *
• Multithreaded sending engine, *
• Direct delivery (built-in SMTP server),
• Support for any number of attachments when creating messages, *
• Ability to create messages using a compatible email client (e.g. Outlook Express) and import them into the program, *
• Integrated support backup/restore of data files,
• at any time press F1 to get context-sensitive HTML help loaded with screenshots.

* Professional Edition only