Downloading Eprivo 1.4.2 for Mac from the developer's website was possible when we last checked. We cannot confirm if there is a free download of this app available. We recommend checking the downloaded files with any free antivirus. The program lies within Communication Tools, more precisely E-mail. The actual developer of this software for Mac is BlueRISC Inc.
From the developer:
EPRIVO lets you secure all your accounts for encrypted e-mail with privacy controls. The application allows future control in both recipient devices and cloud. Also, it enables you to send voice and text e-mails using your existing e-mail addresses and maintain control over sent private e-mails forever. It is ideal for secured communication for employees working remotely and consumers.
You may want to check out more Mac applications, such as Zimbra Toaster, PageSender or Mail to ToDo X, which might be similar to Eprivo.