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There are many reasons why emails end up in spam or are blocked altogether and thus do not reach the recipient as hoped. Having worked at the CSA for nine years, I can tell you that many senders still...

For over two decades, the Certified Senders Alliance (CSA) has had one clear objective: to strengthen trust and quality across the entire email ecosystem. What started as a joint project with mailbox ...

DKIM2 is the evolution of DKIM, which was introduced by the Internet Engineering Task Force (IETF) in 2007 with Request for Comments (RFC) 4871 and was last updated in 2011 with RFC 6376. Conte...

How monitoring can help to identify deliverability issues early on – and why we should reconsider deliverability The examples in this article are based on real-life cases from the CSA Certification...

Many senders believe they are doing everything right. Their domains are authenticated, their campaigns are permission-based, and their deliverability metrics appear stable. Yet sooner or later, some s...

In the world of email deliverability, discussions often focus on content quality, engagement metrics, and authentication protocols such as SPF, DKIM, and DMARC. However, an often-overlooked layer of e...

A statement on the future of trust, deliverability, and self-regulation in commercial emailing Looking Back on 2025: Setting the Course Together When I look back on the year 2025, I do so with pride...

Our colleague Sebastian Kluth will speak at E-Mail LIVE – Digital Bash in Hamburg. Joins his session on 10 February. He’ll share practical insights on email deliverability in 2026 from authentication ...

“The old domain was burned– so we started fresh.” A phrase that is often heard in practice. A supposedly quick fix, but one that usually leads to even greater delivery problems in practice. The ...

How Halon uses machine learning to simplify one of email’s biggest challenges Every deliverability expert knows the chaos of bounce management: vague error messages, endless regex rules, and the cons...