The companies losing the most money in email marketing are not the ones with bad creative. They are the ones trapped inside an ESP contract they signed three years ago, paying for features they cannot audit, running on shared infrastructure they do not control, with data they cannot easily extract. ESP vendor lock-in risks have […]

Enterprise teams evaluating the best open source email marketing platform consistently underestimate one variable: total cost of ownership diverges sharply from licensing cost within 18 months. The platform is rarely the budget problem. The infrastructure around it is. Before you shortlist tools, run this checklist. What “Open Source” Actually Costs at Scale Open source eliminates […]

Your ESP’s support team told you the emails were delivered. Your dashboard shows a 99% delivery rate. But revenue from email dropped 30% last quarter. These two facts are not contradictory – they are the exact gap an email deliverability consultant exists to explain. Delivery rate measures whether a server accepted your message. Inbox placement […]

Estaba en la sala cuando un ingeniero de entregabilidad se levantó en el DS2026 y dijo, tranquilamente, que DMARC p=reject ya no era una práctica avanzada. Era el punto de partida. La mitad del público asintió. La otra mitad se quedó pálida. Esa reacción dice mucho. Durante años el sector habló de estos estándares de […]

I was in the room when a deliverability engineer stood up at DS2026 and said, quietly, that DMARC p=reject was no longer advanced practice. It was the floor. Half the audience nodded. The other half went pale. That reaction tells you something. For years the industry talked about these authentication standards as aspirational. In 2026, […]

SendPost analyzed 4 billion messages across 2025, and the headline number is blunt: emails with all HTTPS links hit a 98.1% delivery rate, while a single HTTP link in the body caused a measurable drop. LB Blair and Varun Jain presented the dataset at the Deliverability Summit 2026 in Barcelona, and the takeaways reshape what […]