SFR Postmaster(y) page

To help the sender community, we are very happy to share our experience collected over the past years, about Mailbox providers. This article is about a historic provider in France: SFR Grand Public (sfr.fr, neuf.fr, club-internet.fr, cegetel.net, numericable.fr, etc…). Postmastery integrates data from the aggregated Feedback Loop of SFR Grand Public, through its monitoring tool […]

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Categories: Authentication, General, ISP, Postmaster(y) ISP pages

Office 365 / Microsoft 365 Postmaster(y) page

To help the sender community, we are glad to share our experiences collected over the years with some ISPs. This page is about Office 365 which is a subscription-based suite of productivity software and services developed by Microsoft. In this article we will focus on their email hosting solution: Exchange Online. We will highlight below […]

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Categories: Authentication, Postmaster(y) ISP pages

Making the Choice: On-Prem or ESPs?

In June of this year, we were in Prague as one of the proud sponsors of the Deliverability Summit. We also took part in a great panel discussion Expert Advice from Alice Cornell, Steve Tuck of Halon, Matthew Grove of Mailchimp and our own Maarten Oelering. The discussion focussed on owning your email infrastructure. https://vimeo.com/845510055/4570b89de8? […]

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Categories: Authentication, Deliverability, General

Yahoo Postmaster(y) page

To help the sender community, we are glad to share our experiences collected over the years with some ISPs. This page is about Yahoo webmail (Yahoo postmaster) being one of the most used in the world. Postmastery is fully integrated with Yahoo’s CFL program, through its monitoring tools. We will highlight below topics: – Latest […]

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Categories: Authentication, ISP, Postmaster(y) ISP pages

Improve Email Delivery with PowerMTA’s Defer-Job Setting

Email delivery is a critical aspect of any business’s communication strategy. However, maintaining a good reputation for your email delivery IP can be a challenge, especially when using a shared IP with multiple customers. In such a scenario, the actions of one customer with a low reputation can adversely affect the entire queue, causing delays […]

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Categories: Authentication, Deliverability, General, PowerMTA

Postmastery joins Signal Spam

Postmastery is becoming a member of Signal Spam to ensure our clients have maximum visibility into reputational threats and complaints emanating from the french eco-system. Signal Spam is a non-profit organisation dedicated to fighting against electronic messaging abuse, including spam, phishing, and malicious email content. It was founded in 2005 and is based in Paris, […]

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Categories: Authentication, Deliverability, General

Outlook Postmaster(y) page

IMPORTANT UPDATE 02/04/2025: Outlook announced on their Community Blog that they will enforce requirements for High Volume sender starting May 5, 2025. To help the sender community, we are glad to share our experiences collected over the years with some ISPs. This page concerns Outlook.com, whose webmail is one of the most widely used in […]

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Categories: Authentication, Deliverability, ISP

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