As cynical as this may sound in our age of mass email spamming, it is the best way for contacting registered users. The Mass Mail component gives you the tool to do this. Mail To Child Groups: If you check this, the subgroups of the selected user group also get mail. Send in HTML mode: Check this if you want the mass mailing to be sent in HTML format. HTML mail is getting more and more popular. Keep in mind, however, that many email clients can deactivate HTML display and that some recipients don't like HTML mail for various reasons. Group: Here you select which user group you want to target with the mass mailing. Subject: The subject matter of your email Message: The actual text In order to be able to send your mass mailing, the mail settings in Site | Global Configuration | Server | Mail Settings have to be set correctly. If you want to send a mass mailing from your local environment, but you don't have a mail server, you can enter the settings of your mail provider's SMTP server.