Sup

6.0easy start · #112of 143
in Email clients

Well documentedyes
Runs where you workno

Runs on Linux, Mac.

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Sup is ranked #112 of 143 in email clients on The Geeks Club. It runs on Linux, macOS.

Compared on email clients

App coverage: desktop

Best Sup alternatives

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The record

Product: Sup is a console-based email client for people with a lot of email.
Threads and tags: It organizes messages into hierarchical threads that can have multiple tags.
Search: It provides a fast local full-text index and supports searching message bodies with query predicates.
Mail sources: It can combine email from mbox files and Maildir sources.
Accounts: It supports multiple accounts and selects the corresponding SMTP server, signature, and sender address when replying.
Customization: Ruby hooks let users add custom code for handling message types and message text.
Privacy: The product page says Sup has full support for GPG.
Platform support: The wiki lists Debian/Ubuntu, Fedora, Arch Linux, macOS, FreeBSD, and OpenBSD instructions, and says Windows is not supported.
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.
Security: The security guide cautions that attachment content-type and filename metadata are sender-controlled and should not be used uncritically in commands.
Support: The community page directs users to the supmua mailing list to ask for help and follow discussions.
Maintenance: The repository describes Sup as mature and production-quality, with maintainers focused mainly on preserving its current feature set.
License: The repository says Sup is free software under the GNU General Public License, version 2 or later.
Latest listed release: The releases page lists sup-1.4.gem dated 21 April 2026.

Where it ranks on The Geeks Club

Best Email Clients in 2026#112 of 143

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Sources

supmua.dev· checked 5 Oct 2026
github.com/sup-heliotrope/sup/wiki· checked 5 Oct 2026
github.com/sup-heliotrope/sup/· checked 5 Oct 2026
github.com/sup-heliotrope/sup/wiki/Secure-usage-of· checked 5 Oct 2026
supmua.dev/community/· checked 5 Oct 2026
supmua.dev/releases/· checked 5 Oct 2026