Action: Exchange Online: Add SPF record to prevent spam sent from your domain An SPF record is a text (TXT) record that helps ...

Action: Exchange Online: Add SPF record to prevent spam sent from your domain  An SPF record is a text (TXT) record that helps prevent other people from using your domain to send spam or other malicious email. SPF records work by identifying the servers that are authorized to send email from your domain. If your organization is using Exchange Online with Office 365, you'll want to configure the SPF record. Learn more at External DNS records required for SPF and Customize an SPF record to validate outbound email sent from your domain.