From Trustworthy Communication:
KidMail E-mail for Kids is a fun, interactive e-mail program designed for kids from preschool through 4th grade. It is intended for use with the 'KidMail.net' Safe Spam Free E-Mail Service (a free trial account on KidMail.net is created after download). The KidMail E-mail for Kids software will also work with any POP3/SMTP e-mail service (online registration is required for this upgrade; no additional download is needed). KidMail has five engaging themes: Dinosaurs, Haunted House, Tropical Island, Outer Space, and Secret Agent. As your child matures, an address book transfer option is available from the KidMail software to Outlook Express or IncrediMail (our recommended client for older kids). Note: KidMail.net ensures that no spam or inappropriate communication reaches children. Parents also control who is allowed to communicate. The KidMail E-mail for Kids software when used with any other POP3 service relies on antispam and anti-virus protections of that service.