WildDuck

WildDuck: A scalable, modern IMAP/POP3 server for large-scale email deployments

About WildDuck

WildDuck is a high-performance IMAP/POP3 server designed for environments with 1000+ accounts, offering horizontal scaling through MongoDB sharding and stateless architecture. Built on Node.js, it integrates seamlessly with Haraka (inbound SMTP) and ZoneMTA (outbound SMTP) to create a complete mail server solution. With full IMAP support, Unicode native capabilities, and robust security features like 2FA and PGP encryption, WildDuck ensures reliability, flexibility, and ease of management via a REST API.

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Archiveopteryx.org

Archiveopteryx is an open-source email server that stores messages in a database and delivers secure IMAP, POP, and SMTP access.

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