PowerMTA

PowerMTA is an enterprise-grade email message transfer agent (MTA) for sending high-volume and mission critical messages. PowerMTA provides unsurpassed reliability in message delivery in a stable SMTP environment with granular connection controls. Superior message throughput, simple set up and real-time analysis provide PowerMTA users with performance, deliverability, and manageability with a much smaller hardware footprint than is possible with either open source options or other commercial solutions. It just works!