You could have downloaded KidzMail X 1.5 for Mac from our software library for free. The application lies within Design & Photo Tools, more precisely General. This Mac application was originally created by HaranBanjo.
From the developer:
KidzMail is a full-featured email client designed for children. With KidzMail, children draw pictures and send them to people in their address book. Addressing email is as simple as choosing recipients from a list of pictures and names. Parents control the address book, so they know who their children are sending email to. KidzMail is made with REALbasic from REAL Software, Inc.
KidzMail sends real email that any email client will accept.
You may want to check out more software for Mac, such as HueGo or FlipBook Creator for Mac, which might be similar to KidzMail X.