The Postmastery Blog: Insights, Tools & Best Practices for Email Deliverability
PowerMTA 6.0r6 released | Key Updates Overview
2026/04/29 by Syed Alam.
We are pleased to announce that PowerMTA 6.0r6 was released. This latest PowerMTA release introduces a number of enhancements, particularly around queue management, routing flexibility, and operational visibility. It brings a lot of advanced features, which keep PowerMTA among the leading MTAs in the market. You will need a PowerMTA 6.0 license with an active […]
Categories: PowerMTA, PowerMTA Release notes
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
From a Deliverability Audit to a KumoMTA Migration: the Laposta Case
2026/04/16 by Yves-Marie Le Pors-Chauvel.
Your email infrastructure is running, emails are going out, campaigns are being sent and performance looks good… Or at least, that’s what you think! But have you ever wondered what an outside perspective on your stack would reveal? That’s exactly what Laposta did when they brought in Postmastery for a full infrastructure audit. And the […]
Categories: Case Studies
Postmastery on BFM Business (French TV) – Understanding Email Deliverability and Its Impact
2025/11/10 by Yves-Marie Le Pors-Chauvel.
We are proud to share that Postmastery was recently featured on BFM Business, in an interview hosted by Gilane Barret and produced in collaboration with OpenMedias. The goal of this interview was simple: explain who Postmastery is and make the often misunderstood topic of email deliverability accessible to everyone. Why talk about deliverability? Deliverability is […]
Yahoo Launches New “Insights Dashboard” for Senders
2025/10/08 by Yves-Marie Le Pors-Chauvel.
Yahoo has just launched a new Insights Dashboard in its Yahoo Sender Hub, providing senders with valuable visibility into delivery performance and complaint rates. This long-awaited feature gives email senders actionable data to help monitor their reputation and maintain strong deliverability to Yahoo Mail users. Here’s a full overview of what’s included and how you […]
Categories: ISP
Gmail Postmaster Tools v1 Is Retiring: What You Need to Know
2025/09/25 by Yves-Marie Le Pors-Chauvel.
If you work in email deliverability, you probably spend a lot of time in Gmail Postmaster Tools. It’s where we check sender reputation, monitor spam complaints, and generally keep an eye on how Gmail sees our emails. Google has just announced an important change: the old Postmaster Tools interface (v1) will be deprecated on September […]
Navigating the Nuances of the Comcast Complaint Feedback Loop
2025/08/29 by Maarten Oelering.
For email senders, a Feedback Loop (FBL) is an indispensable tool for maintaining a healthy sender reputation. It provides direct feedback from mailbox providers when a recipient marks an email as spam. One of the key FBLs in the email ecosystem has been from Comcast, a major internet service provider in the United States. However, […]