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Larch

Tool for one-time IMAP mailbox migration

Mail Servers Archived ★ 615 stars Medium setup GPL-2.0

This project is archived. Upstream development has stopped, so expect no new features or security fixes. Consider an actively maintained mail servers alternative.

Larch is a utility that copies messages and folders from one IMAP server to another, useful for migrating mailboxes when moving to a self-hosted mail server. It preserves flags and folder hierarchy.

Official siteSource code

Key features

  • One-time IMAP mailbox migration
  • Preserves flags and folders
  • Server-to-server copy

Strengths

  • Released under the GPL-2.0 license
  • Written in Ruby
  • Tiny footprint — runs in 128 MB RAM

Is Larch secure?

OSV.dev has no published security advisories for Larch's repository. No known vulnerabilities is not proof of security: it means none have been publicly catalogued.

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

Larch replaces

Self-hosted Hosted migration services alternatives

Health badge

Maintain Larch? Add its health score to your README. The badge links back to this page.

SelfHostIndex: 14 · archived

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[![SelfHostIndex health score for Larch](https://selfhostindex.com/badge/larch-imap.svg)](https://selfhostindex.com/app/larch-imap/)
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<a href="https://selfhostindex.com/app/larch-imap/"><img src="https://selfhostindex.com/badge/larch-imap.svg" alt="SelfHostIndex health score for Larch"></a>
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.. image:: https://selfhostindex.com/badge/larch-imap.svg
   :alt: SelfHostIndex health score for Larch
   :target: https://selfhostindex.com/app/larch-imap/

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

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