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We've been using Kumo MTA for six months now, and it's hands-down the best MTA out there. It's open-source, super customizable, and insanely high-performance. Plus, it's very stable and comes with complete and clear documentation. The team behind Kumo knows their stuff—everything about it is well-designed and can handle pretty much any email situation from a simple single-tenant installation sending a few thousand transactional emails a month to large scale distributed multi-tenant ESPs with complex shaping, sending and throttling rules sending millions of messages a day. Highly recommended!
