Courier IMAP is an open-source IMAP and POP3 mail server designed for high performance, scalability, and security. It is widely used for handling Maildir-based mail storage and integrates well with existing mail transport agents (MTAs) like Postfix, Exim, and Qmail. With built-in support for SSL/TLS encryption and flexible authentication methods, Courier IMAP is a solid choice for many Linux-based email deployments.
Key Features
1. Maildir Support
Courier IMAP natively supports the Maildir format, which improves reliability and efficiency compared to traditional mbox formats. Each email is stored as a separate file, reducing the risk of corruption and allowing for faster message access.
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