Case Study: Sailthru achieves stable, scalable delivery of hundreds of millions of personalized emails daily with Bird (formerly MessageBird)

How Sailthru Deploys Hundreds of Millions of Personalized Emails Daily Using PowerMTA™

Sailthru, an omnichannel marketing technology company that personalizes delivery time for each user, faced the challenge of reliably sending hundreds of millions of automated, personalized emails daily. Their open-source Postfix setup struggled with traffic management, large server clusters, fine-grained connection throttling, and stability, so Sailthru evaluated commercial messaging platforms and considered solutions like PowerMTA™ alongside vendors such as Bird (formerly MessageBird).

Bird (formerly MessageBird) implemented a PowerMTA™-based solution that gave Sailthru real-time queue visibility, flexible queue-to-queue transfers under heavy load, responsive reporting, and JOBID campaign tracking. The result was dramatically improved stability and manageability—enabling Sailthru to maintain large server clusters, reduce load times during peaks, and reliably deliver hundreds of millions of personalized emails each day.

Sailthru

Ken Pfeiffer

Director of Global Delivery