Internet Message Access Protocol (IMAP) servers such as Courier-IMAP and Cyrus IMAP may work well, but they’re complicated to install and configure. I'll show you how to set up your mail server quickly and securely using Dovecot, an open source IMAP and Post Office Protocol version 3 (POP3) server for Unix-like operating systems.

Security is Dovecot's top priority. Timo Sirainen, the program's author, uses secure coding practices to avoid common problems and pitfalls. Dovecot maintains the index files of the mailbox constantly, making the application fast, lightweight, and memory-efficient. Sirainen claims that each connection uses only around 100KB of swappable memory.

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