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Infrastructure
Freemium
From $20/mo
Infrastructure Provisioning
Configuration Management
Multi-Cloud Deployment
Courier IMAP server
4.6
Free Highly regarded for its stability and scalability.
A fast, scalable, enterprise IMAP server using Maildirs.
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Refined 2/22/2026
About Courier IMAP server
The Courier IMAP server is a high-performance IMAP and POP3 server designed for enterprise environments. It utilizes Maildir format for mail storage, offering significant advantages in terms of scalability and reliability. The server features a built-in IMAP and POP3 aggregation proxy, enabling horizontal scalability by distributing client connections across a pool of Courier servers. This proxy setup allows for seamless mail account migration between servers, optimizing resource utilization. It supports standard IMAP and POP3 protocols, ensuring compatibility with a wide range of email clients. Courier IMAP can be deployed as a standalone IMAP server or integrated with other mail servers like Qmail, Exim, and Postfix. Its architecture emphasizes efficient resource management and minimal overhead, making it suitable for environments with hundreds of thousands of mail accounts.
Core Capabilities
The Courier IMAP server is a high-performance IMAP and POP3 server designed for enterprise environments.
Main Tasks
Mail Storage
Explore all tools that specialize in mail storage. This domain focus ensures Courier IMAP server delivers optimized results for this specific requirement.
