Step 1: Navigate to Tools & Settings > Spam Filter (in the Mail group).
Step 2: Uncheck the “Switch on server-wide grey-listing spam protection” checkbox.
Step 3: Click OK.
Step 1: Navigate to Tools & Settings > Spam Filter (in the Mail group).
Step 2: Uncheck the “Switch on server-wide grey-listing spam protection” checkbox.
Step 3: Click OK.