A US-based healthcare SaaS platform delivering appointment reminders, test result notifications, and prescription refill alerts to 800,000 patients was experiencing 22% spam placement at Gmail. Patient-critical communications — including lab result notifications — were landing in spam folders, creating both clinical risk and regulatory exposure under HIPAA.
The platform was sending all email (transactional and marketing) from a shared ESP IP pool. A single marketing campaign with a 0.3% complaint rate contaminated the pool's reputation, causing all subsequent transactional sends to be filtered. Because healthcare email contains PHI references, the platform could not use standard shared relays with adequate encryption guarantees.
SolutionWe migrated all transactional healthcare email to a dedicated PowerMTA environment on US-East infrastructure with enforced TLS on every connection, DMARC p=reject with subdomain protection, and a clean separation between transactional (patient-facing) and administrative sending streams. All IPs were warmed exclusively with high-engagement appointment reminder sequences.
Results"When lab result notifications go to spam, it is not a marketing problem — it is a patient safety issue. The infrastructure migration resolved something we had been unable to fix for 14 months."
— CTO, Healthcare SaaS PlatformHealthcare email has zero tolerance for spam placement on critical transactional messages. Dedicated infrastructure with strict TLS enforcement and separation of transactional from administrative email streams is essential. The complaint rate from any marketing-adjacent stream must never be allowed to affect the reputation of patient-communication IPs.
