On May 5, 2025, Microsoft began enforcing stricter email authentication requirements for high-volume senders. If your business sends more than 5,000 emails per day to Microsoft consumer email accounts (such as @outlook.com, @hotmail.com, or @live.com), it is now essential to have SPF, DKIM, and DMARC correctly implemented.
Why This Matters
These authentication protocols help verify that your emails are actually coming from you, and not from a malicious third party pretending to be your domain. Without them, your emails risk being marked as spam or, worse, rejected entirely.
To meet Microsoft’s requirements, you’ll need to implement the following protocols:
- SPF (Sender Policy Framework): Confirms the sending server is authorised for your domain.
- DKIM (DomainKeys Identified Mail): Ensures the content hasn’t been altered in transit.
- DMARC (Domain-based Message Authentication, Reporting, and Conformance): Aligns SPF and DKIM results with your domain’s policy to prevent unauthorised use.
Best Practices for Compliance
To improve deliverability and maintain trust with recipients:
- Implement SPF, DKIM, and DMARC: Configure these protocols in your domain’s DNS settings.
- Use a Valid “From” Address: Ensure your sender address is correct and can receive replies.
- Include a Functional Unsubscribe Link: Provide recipients with an easy way to opt out of future emails.
- Maintain List Hygiene: Regularly remove invalid or inactive email addresses to reduce bounces and complaints.
- Avoid Deceptive Practices: Use clear subject lines and avoid misleading headers.
Next Steps
- Review Your DNS Records: Ensure that your SPF, DKIM, and DMARC records are correctly configured.
- Test Your Email Authentication: Use tools to verify that your emails pass authentication checks.
- Stay Informed: Microsoft may continue tightening enforcement, so keep an eye out for future announcements.
Need Help?
If you need assistance with configuring your email authentication or have questions about these changes, feel free to contact our team of experts at Everything Tech. We’re here to help ensure your emails reach their destination securely. Speak to an expert today.
