MailX

Self-hosted, open-source email infrastructure: SMTP, delivery, and webhooks built in Go.

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MailX is an open-source, self-hosted email infrastructure platform built in Go, handling SMTP mail acceptance, durable delivery with retries, and signed webhooks for lifecycle events like bounces and deliveries. It is aimed at developers who want to run and understand their own transactional email pipeline instead of depending on a closed third-party provider, though it is still under active development and not yet production-ready.

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