Email Deliverability Insights, Tips & Monitoring Strategies
DKIM2: The Future of Email Authentication Is Taking Shape
2026/09/16 by Olivier Moulene.
The original DKIM specification has been a cornerstone of email authentication for more than a decade. However, real-world deployment has exposed fundamental limitations that persist even when layered with DMARC and ARC. What DKIM Still Can’t Prove DKIM today can prove that a domain signed some version of a message, but it still cannot establish […]
Categories: Authentication, Deliverability
The first big SNDS update in years: What Changed and Why It Matters
2026/07/27 by Olivier Moulene.
Microsoft has made major changes to Smart Network Data Services (SNDS), its long-standing tool for monitoring IP reputation and complaint data for Outlook.com. The update brings a new portal, a modern OAuth 2.0 API, changes to complaint reporting, and reduced spam-trap visibility. Some changes are welcome improvements; others require deliverability teams to update existing monitoring […]
Categories: Deliverability, General
Outlook Feedback Loop Is Transitioning to ARF: Recipient Address No Longer Available
2026/06/16 by Olivier Moulene.
Microsoft is retiring its Smart Network Data Services (SNDS) portal after nearly two decades. Beyond confirming access to their SNDS accounts and refreshing ownership of their managed IP ranges, some senders will also need to update their complaint-processing workflows to accommodate the new JMRP complaint data format. This is especially important for senders who rely […]
Categories: Deliverability, Providers
CNIL Recommendation on Email Tracking Pixels: What Changes and the Open Questions
2026/04/28 by Yves-Marie Le Pors-Chauvel.
A NOTE FOR INTERNATIONAL READERS The recommendation discussed in this article is a French regulatory initiative, issued by the CNIL, France’s data protection authority. At first glance, it may seem like a local compliance matter. It is not. Any sender, regardless of where they are established, who sends emails to recipients residing in France is […]
Categories: Deliverability, General
Orange Spain Announces the End of Its Email Services: What All Senders Need to Know Ahead of September 5, 2025
2025/07/04 by Yves-Marie Le Pors-Chauvel.
Orange Spain has officially announced the permanent shutdown of all its email services as of September 5, 2025. What will happen on September 5? All accounts will be permanently closed and deleted—without exception. Even end users will no longer be able to access their messages! This announcement affects anyone using one of the following 17 […]
Categories: Deliverability, Providers
Unlock Peak Performance: Postmastery's Q1 2025 Email Delivery Benchmark is Here
2025/07/03 by Yves-Marie Le Pors-Chauvel.
We are thrilled to announce the release of Postmastery’s Email Delivery Benchmark Q1 2025. This essential study, conducted from January to March 2025, offers a refined analysis incorporating billions of email transactions to deliver an even more robust and comprehensive overview of email performance. What can you find inside? In this edition, we evaluate the most recent delivery trends […]
Categories: Deliverability, Providers
Outlook Deliverability: A Silent Shift with Serious Consequences
2025/06/20 by Yves-Marie Le Pors-Chauvel.
Starting on June 17th, 2025 at 11:10 UTC, multiple high-volume senders – particularly in France – began experiencing a sudden surge in DKIM failures on emails sent to Microsoft domains (Outlook, Hotmail, etc.). These bounces occurred even though SPF and DMARC were properly configured. UPDATE – July, 10 2025 Since the original publication of this […]
Categories: Authentication, Deliverability, Providers