You are receiving emails for different reasons. Here are a few tips to stop them:
If you receive email alerts, you can delete the alerts you created in your account to stop them
If you receive newsletters or different offers, follow the steps below:
Go to Vivastreet and login into your account
Click on the tab "My details" and scroll down to the bottom of the page
Untick the boxes under "Email Preferences" to stop emails from Vivastreet
Vivastreet will still send you messages if your ad cannot be posted (disabled).