passariello/zone-mta

ZoneMTA is a modern, cross-platform outbound SMTP relay (MTA/MSA) built on Node.js and MongoDB, designed for granular control over message routing. It allows trusted senders to be routed through high-speed virtual "sending zones" using high-reputation IP addresses, while less trusted senders can be routed through slower zones or IPs with lower reputation. The system includes features like automatic DKIM signing, connection pooling, IP warm-up, bounce handling, and a built-in plugin system inherited from Nodemailer. It is ideal for organizations needing a scalable, high-performance email delivery solution with advanced routing and monitoring capabilities.