The Postmastery Blog: Insights, Tools & Best Practices for Email Deliverability
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, […]
Laposte.net tightens its requirements for email authentication
2025/08/25 by Yves-Marie Le Pors-Chauvel.
On Friday, August 22, in a message shared by Simon Bressier, Postmaster of Laposte.net, the mail provider announced a major shift in its deliverability and anti-spam policy starting in September 2025. The French webmail confirmed that email authentication standards (SPF, DKIM, and DMARC) will no longer be optional. Until now, some emails without authentication protocols […]
Categories: Authentication, DMARC, Providers
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