A German EdTech platform serving 2 million learners across 40 countries faced a three-way deliverability problem: corporate email gateways filtering learning notifications as promotional; university IT departments blocking email from commercial domains; and consumer inbox placement under 70% at Gmail due to low engagement from passive learners.
The platform used a single sending domain for all email types: course completions, assignment deadlines, instructor messages, promotional upsells, and marketing campaigns. The promotional email drove complaint rates above 0.15%, which degraded inbox placement for critical course notifications. University mail systems were blocking the commercial sending domain entirely.
SolutionWe implemented a multi-domain, multi-IP architecture: course.platform.com for academic notifications (dedicated IPs, strict authentication), news.platform.com for marketing (separate IPs, isolated reputation), and certificates.platform.com for verified achievement email. Each domain was independently warmed. University-specific sending used separate IPs with academic-focused PTR naming.
Results"Students were missing assignment deadlines because notifications were going to spam. The multi-domain architecture separated our operational email from our marketing in a way that fixed both problems simultaneously."
— Head of Product, EdTech PlatformEdTech platforms serve multiple inbox environments simultaneously — corporate, university, and consumer — each with different filtering rules. A single-domain architecture cannot optimize for all three. Domain segmentation by email purpose is the only scalable solution.
