The download of OxiMailing will start shortly. If it's not the case, click here.
Follow the instructions below to install OxiMailing on your Mac :
This manipulation is required because OxiMailing is not installed from the Apple's App Store.
You'll not have to repeat them each time you'll run the software, just click on "OxiMailing" to start it.
For more information, please read this article : https://support.apple.com/kb/PH18657.