With continued, persistent phishing attacks affecting organizations of all sizes across all industries, a resurgence of investment in email security solutions is occurring. As organizations shift their email strategies to cloud-delivered providers, most falsely believe that these providers offer comprehensive email security controls. Traditional secure email gateways are no longer sufficient to protect organizations against modern email attack techniques. Third-party email security controls will be required to effectively secure organizations utilizing cloud-delivered email services against modern, sophisticated, email-borne attacks.