In this tutorial, we explain how SPF, DKIM & DMARC work to protect your email server from spam related to spoofing or email message tampering. SPF, DKIM and DMARC are included in MDaemon® Email Server and SecurityGateway™ for Email. SecurityGateway is a secure email gateway solution that protects Microsoft 365/Office 365, Microsoft Exchange Server, G-Suite, Kerio, and other email servers from spam, phishing, malware, data leaks (DLP), and much more. Learn more at .