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EditBy Dovecot is an open source IMAP and POP3 server for Linux/UNIX-like systems, written with security primarily in mind. Dovecot is an excellent choice for both small and large installations. It's fast, simple to set up, requires no special administration and it uses very little memory. Some of the most notable features of Dovecot include: Dovecot is among the highest performing IMAP servers while still supporting the standard MBox and Maildir formats. The mailboxes are transparently indexed, which gives Dovecot its good performance while still providing full compatibility with existing mailbox handling tools. Dovecot is standards compliant. Dovecot v1.1 passes all IMAP server standard compliancy tests while most other servers FAIL many of them. Dovecot's indexes are self-optimizing. They contain exactly what the user's client commonly needs, no more and no less. Dovecot is self-healing. It tries to fix most of the problems it notices by itself, such as broken index files. The problems are however logged so the administrator can later try to figure out what caused them. Dovecot tries to be admin-friendly. Common error messages are made as easily understandable as possible. Any crash, no matter how it happened, is considered a bug that will be fixed. Dovecot allows mailboxes and their indexes to be modified by multiple computers at the same time, while still performing well. This means that Dovecot works with NFS and clustered filesystems. Dovecot's user authentication is extremely flexible and feature rich, supporting many different authentication databases and mechanisms. Postfix 2.3+ and Exim 4.64+ users can do SMTP authentication directly against Dovecot's authentication backend without having to configure it separately. Dovecot supports Easy Migration from many existing IMAP and POP3 servers, allowing the change to be transparent to existing users.

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