The Postmark team has made significant changes to their API, which is now hosted on Amazon EC2, with the aim of improving stability, performance, and scalability. The new architecture provides a massively redundant system, allowing for failover, load balancing, and scalability. This change enables better handling of increasing email volumes, ensuring Postmark's continued availability and performance. The team has also introduced lightweight instances and used Dynect for DNS load balancing to minimize downtime and optimize performance. With the new tools, the team expects improved throughput and overall better performance, while continuing to build a robust architecture that handles failures at each level without downtime.