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

PowerMTA 5.0: Using a proxy for email delivery

One new thing we are particularly excited about is PowerMTA 5.0 support for forward proxies: this allows delivery from IPs which don’t need to be co-located on the same server or subnet. In this blog post, we will explain this with a few use cases and introduce Postmastery’s MTA proxy for a ready-to-go solution. Use […]

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Categories: Authentication, Deliverability, General, PowerMTA

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