Here's where you can find the Email Marketing system on Wix (used to be called Wix ShoutOut, but I don't see that branding anymore). I had a website design client ask where the Email Marketing system was as Wix changed the interface, so here's a quick video tip on how to find and send emails through Wix.
First, login to Wix.com
Then, make sure you see Dashboard in upper left,
then look down the menu on the left for "Marketing Tools" - click on it
Then Click on "Email Marketing"
Now you will be in the Wix Email Marketing system (also known as Wix ShoutOut). Here you can reuse existing campaigns (and edit them to be new) or create new ones from scratch.