Sup is an open source curses threads-with tags style email client. It presents an interface of a list of threads, which are each hierarchical collections email messages.
Threads can have multiple tags applied to them. It supports a very fast full-text search, automatic contact-list management, custom code insertion via a Ruby hook system, and more.
Unlike Gmail, Sup has no ads, it doesn’t need a mouse and has programmability and extensibility built-in to its design.
- Handles massive amounts of email.
- GMail-like thread-centered archiving, tagging and muting.
- Fast, local full-text index of messages.
- Mix email from different sources: mbox files and maildirs.
- Instantaneously search over your entire email collection. Search over body text, or use a rich query language to combine search predicates in any way.
- Handle multiple accounts. Replying to email sent to a particular account will use the correct SMTP server, signature, and from address.
- Add custom code to handle certain types of messages or to handle certain types of text within messages.
- Take care of your privacy with full support of gpg.
- Organize email with user-defined labels, automatically track recent contacts, and much more.
- Ruby-programmable hooks.
- Automatically tracking recent contacts.
Website: sup-heliotrope.github.io
Support: Wiki, GitHub Code Repository
Developer: Sup community
License: GNU General Public License v2.0

Sup is written in Ruby. Learn Ruby with our recommended free books and free tutorials.
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Read our verdict in the software roundup.
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