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SU

Sup

Console-based threaded email client

Mail Servers ★ 972 stars Medium setup GPL-2.0

Sup is a console-based email client that provides a fast, tag-based interface inspired by web mail and search engines. It indexes large mailboxes and works well with self-hosted IMAP or Maildir accounts.

Official siteSource code

Key features

  • Console threaded email client
  • Fast tag-based search
  • Handles large mailboxes

Strengths

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

Is Sup secure?

OSV.dev has no published security advisories for Sup'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.

Sup replaces

Self-hosted Mutt alternatives

Health badge

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

SelfHostIndex: 78 · good

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

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

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