This one’s easy!
If you’re using the website: Click on the cog icon in the upper right corner. You’ll see several checkboxes, including an option to turn off receiving e-mail notifications for messages.
If you’re using the Grokio Communities app: Click on the bottom right tab, called “Me” and navigate down the list to the section called “Settings”. Clicking on it will show several toggle options. If you untoggle “Forward to Email” it will stop sending you email notifications of new messages.
Hope this helps,
The Grokio Support Team