What is Cyrus IMAP?

Cyrus IMAP is an efficient, reliable, and scalable server for email, calendar, and contacts. Cyrus is free and open source.

Cyrus supports JMAP, IMAP, POP3, CalDAV, CardDAV, NNTP, and many other standards. It supports Sieve for filtering email. You can read more about Cyrus features in our full list of features.

• This is version 3.13.0-alpha0: development branch.

• The latest stable version 3.12.0-beta1 is at https://www.cyrusimap.org/.

Cyrus IMAP supports many authentication options. It uses Cyrus SASL, an implementation of the Simple Authentication and Security Layer (SASL) system. You can read more at the Cyrus SASL System Administrator's Guide.

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Contents:

• Download
  • Get Cyrus
  • Release Notes
  • Notes for Packagers
• Quickstart Guide
  • Introduction to Cyrus IMAP
  • Quick install
• Overview
  • Features
  • Concepts
• Setup
  • Compiling
  • Installing Cyrus
  • Upgrading to 3.12
  • Configuration Guide
• Operations
  • Man pages
  • Administrator Guide
  • Frequently Asked Questions
• Developer Resources
  • The Development Process
  • Cyrus Internals
• Support/Community
  • Found a bug?
  • Mailing lists
  • Weekly meetings
  • About