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OfflineIMAP

Synchronize IMAP mailboxes to local Maildir

Mail Servers ★ 634 stars Medium setup GPL-2.0

OfflineIMAP is a tool that downloads and synchronizes IMAP folders to a local Maildir so mail can be read and searched offline. It supports flexible Python-based configuration and account hooks.

Official siteSource code

Key features

  • IMAP to Maildir sync
  • Offline mail access
  • Python configuration
  • Multiple account support

Strengths

  • Released under the GPL-2.0 license
  • Written in Python
  • Tiny footprint — runs in 64 MB RAM

Is OfflineIMAP secure?

No known vulnerabilities affect OfflineIMAP's latest release (v8.0.3). OSV.dev lists 1 past advisory for the project; none of them applies to this release. No known vulnerabilities is not proof of security: it means none have been publicly catalogued.

  • Most recent fixed advisory CVE-2020-37248, published 2026-06-08 (128 days ago), fixed in 8.0.3

Source: OSV.dev, checked 2026-10-14. How this is measured.

OfflineIMAP replaces

Self-hosted Outlook offline mode alternatives

Health badge

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SelfHostIndex: 76 · good

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The score is recomputed on every nightly rebuild from public repository data — see how it is calculated.

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