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Sup

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Sup

Free

GPL-2.0 licensed email client

Every plan, in full

On the record

Accounts
It supports multiple accounts and selects the corresponding SMTP server, signature, and sender address when replying.supmua.dev · read 12 Oct 2026
App coverage
desktopsupmua.dev · read 20 Sep 2026
Contacts and labels
Sup tracks recent contacts and supports user-defined labels.supmua.dev · read 12 Oct 2026
Customization
Ruby hooks can add custom code to handle message types or text within messages.supmua.dev · read 12 Oct 2026
Integrations
The project wiki documents mail retrieval through OfflineIMAP, mbsync/isync, and Fetchmail, and sending through msmtp, putmail, and sendEmail.github.com · read 12 Oct 2026
Latest listed release
The releases page lists sup-1.4.gem dated 21 April 2026.supmua.dev · read 5 Oct 2026
License
The repository says Sup is free software under the GNU General Public License, version 2 or later.github.com · read 5 Oct 2026
Limitation
Sup may not work smoothly alongside other mail clients because not all changes can be synchronized back to the mail source.github.com · read 12 Oct 2026
Mail-client compatibility
The repository README says Sup generally does not work smoothly with other mail clients and that not all changes sync back to the mail source.github.com · read 5 Oct 2026
Mail sources
It handles mail from multiple mbox and Maildir sources.github.com · read 12 Oct 2026
Maintenance
The maintainers describe Sup as mature and production-quality, focus on preserving its current feature set, and welcome bug-fix and compatibility pull requests.github.com · read 12 Oct 2026
Platform support
The wiki lists Debian/Ubuntu, Fedora, Arch Linux, macOS, FreeBSD, and OpenBSD installation guidance and says Windows is not supported.github.com · read 12 Oct 2026
Privacy
The feature list states that Sup supports GPG.supmua.dev · read 12 Oct 2026
Product
Sup is a console-based email client for people with a lot of email.supmua.dev · read 12 Oct 2026
Search
It provides a local full-text index and searches message bodies using a query language.supmua.dev · read 12 Oct 2026
Security
The security guide cautions that attachment content-type and filename metadata are sender-controlled and should not be used uncritically in commands.github.com · read 5 Oct 2026
Support
The project directs bug reports to its GitHub issue tracker and provides a mailing list for general discussion, development, and announcements.github.com · read 12 Oct 2026
Threaded email
It displays hierarchical email threads that can have multiple tags.supmua.dev · read 12 Oct 2026

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