What Are the New Requirements?

Starting 2025-05-05, Microsoft Outlook will begin enforcing the following standards:

  1. SPF (Sender Policy Framework): Clearly define which IP addresses are authorized to send mail for your domain.

  2. DKIM (DomainKeys Identified Mail): Digitally sign outgoing emails to ensure the message has not been altered in transit.

  3. DMARC (Domain-based Message Authentication, Reporting & Conformance): Publish a policy that tells receiving servers what to do when SPF or DKIM checks fail - at a minimum, p=none is required.

These protocols are not optional. Non-compliant emails will begin landing in junk folders, with full rejection coming later.

Additional Recommendations

  • Use valid and monitored sender addresses.

  • Include a clear unsubscribe option.

  • Maintain clean email lists.

  • Avoid misleading headers and subject lines.

  • Only send emails to recipients who have given explicit consent.

How Excedo Can Help?

Implementing SPF, DKIM, and DMARC correctly can be technically complex, especially for organizations that send high volumes of emails through various third-party platforms. That is where Excedo Networks comes in.

With Excedo, You Can:

✅ Assess your current email setup
Excedo provides a comprehensive analysis of your domain's email security posture, identifying weak spots and misconfigurations.

✅ Deploy and configure DMARC correctly
From initial setup (p=none) to strict enforcement (p=quarantine or p=reject), Excedo ensures your policy aligns with business goals—without impacting legitimate email delivery.

✅ Manage SPF & DKIM alignment
Excedo helps you avoid common pitfalls like exceeding DNS lookup limits or misaligned signatures that can break your authentication.

✅ Monitor with detailed reporting
With ongoing DMARC reports, Excedo gives visibility into who is sending on your behalf - legitimately or maliciously.

✅ Provide expert guidance and ongoing support
Whether you are starting from nothing or optimizing an existing policy, Excedo’ s team offers guidance tailored to your organization’s infrastructure and email practices.

Act Now!

Do not wait until 2025-05-05. Review your email authentication setup today, and if you need help navigating DMARC implementation, Excedo is ready to support you every step of the way.

By aligning with Microsoft Outlook’s new standards and adopting best practices with expert help, you will boost your email deliverability, safeguard your brand, and help build a more secure internet for everyone.

Contact us for a free consultation: