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Dovecot (software)

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Free software IMAP and POP3 server
Dovecot
Original author Timo Sirainen
Developers Timo Sirainen and contributors
Initial releaseJuly 2002; 23 years ago (2002-07)
Stable release
2.4.2[1]  Edit this on Wikidata / 29 October 2025; 0 days ago (29 October 2025)
Repository
Written inC
Operating system Unix-like
Type IMAP and POP3 server
License Mostly MIT and LGPLv2 [2]
Websitewww.dovecot.org  Edit this on Wikidata

Dovecot is an open-source IMAP and POP3 server for Unix-like operating systems, written primarily with security in mind.[3] Timo Sirainen originated Dovecot and first released it in July 2002. Dovecot developers primarily aim to produce a lightweight, fast and easy-to-set-up open-source email server.

The primary purpose of Dovecot is to act as a mail storage server. The mail is delivered to the server using some mail delivery agent (MDA) and is stored for later access with an email client (mail user agent, or MUA). Dovecot can also act as mail proxy server, forwarding connection to another mail server, or act as a lightweight MUA in order to retrieve and manipulate mail on remote server for e.g. mail migration.

According to the Open Email Survey, as of 2020, Dovecot has an installed base of at least 2.9 million IMAP servers, and has a global market share of 76.9% of all IMAP servers. The results of the same survey in 2019 gave figures of 2.6 million and 76.2%, respectively.[4]

Features

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Dovecot can work with standard mbox, Maildir, and its own native high-performance dbox formats.[5] It is fully compatible with UW IMAP and Courier IMAP servers' implementation of them, as well as mail clients accessing the mailboxes directly.

Dovecot also includes a mail delivery agent (called Local delivery agent in Dovecot's documentation) and an LMTP server, with the optional Sieve filtering support.

Dovecot supports a variety of authentication schemas for IMAP, POP and message submission agent (MSA) access, including CRAM-MD5 and the more secure DIGEST-MD5.

With version 2.2, some new features have been added to Dovecot, e.g. additional IMAP command extensions, dsync has been rewritten or optimized, and shared mailboxes now support per-user flags.[6]

Version 2.3 adds a message submission agent, Lua scripting for authentication, and some other improvements.[7]

In 2017, Mozilla, via the Mozilla Open Source Support program, conducted a security audit on the Dovecot software, the first public audit of the Dovecot code. The team that performed the audit was extremely impressed with the quality of the dovecot code, writing that "despite much effort and thoroughly all-encompassing approach, the Cure53 testers only managed to assert the excellent security-standing of Dovecot. More specifically, only three minor security issues have been found in the codebase, thus translating to an exceptionally good outcome for Dovecot, and a true testament to the fact that keeping security promises is at the core of the Dovecot development and operations.".[8]

See also

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References

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  1. ^ "Dovecot v2.4.2". 29 October 2025. Retrieved 29 October 2025.
  2. ^ "COPYING.LGPL file in dovecot repository" . Retrieved 2017年10月04日.
  3. ^ "Dovecot website" . Retrieved 2017年01月18日.
  4. ^ Sirainen, Timo (2019年03月01日). "Dovecot's global market share grows to 76%". Open-Xchange. Archived from the original on 2020年03月05日. Retrieved 2020年03月05日.
  5. ^ "dbox Mailbox Format". Dovecot v2.x Wiki. 2012年10月30日. Retrieved 2024年07月17日.
  6. ^ "v2.2.0 released". 2013年04月12日. Retrieved 2013年06月17日.
  7. ^ "v2.3.0 released". 2017年12月22日. Retrieved 2018年03月12日.
  8. ^ "Mozilla Security Audit" . Retrieved 2017年01月13日.
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