Microsoft is implementing stricter email security protocols for high-volume senders, requiring compliance with SPF, DKIM, and DMARC. Non-compliant emails risk being blocked or rejected entirely.
Understanding the Basics
SPF (Sender Policy Framework) authorises specific mail servers to send email on behalf of your domain. DKIM (DomainKeys Identified Mail) adds a digital signature proving authenticity. DMARC ties the two together, instructing receiving servers how to handle authentication failures.
Who Is Affected?
Organisations using Microsoft 365, sending over 5,000 daily emails, or running email marketing campaigns must comply. Non-compliance results in flagged or rejected emails, decreased open rates, and damaged domain reputation.
Real-World Risks of Ignoring Email Authentication
Unprotected domains enable scammers to impersonate companies, causing customer distrust and potential legal consequences, while failed deliveries directly reduce sales and engagement.
Sendmarc to the Rescue
Sendmarc is an email security platform that automates SPF, DKIM, and DMARC compliance — handling DNS record configuration, compliance monitoring, and reporting without manual intervention, with real-time monitoring and enforcement tools designed for non-technical users.
Steps to Get Compliant
Manual configuration requires DNS knowledge and poses error risk; automated solutions like Sendmarc offer a roughly 30-minute setup with automated monitoring and expert support.
Not sure if your domain is compliant? Get in touch and we'll run a health check.