restmail is a sendmail-compatible CLI using gmail & outlook rest APIs. It can be used for email automation, notifications and with git send-mail for sharing patches.

restmail requires only minimal authorization scope to send mail. No access to reading or deleting mail is needed.

A feature-rich terminal interface for Gmail, combining the efficiency of CLI with the familiarity of Gmail's core functionality. Built with Go and Bubble Tea for a fast, keyboard-driven experience.

Access GMail in the Linux terminal easily and safely!

Boasting an extremely simple and streamlined user interface and every feature a normal email user would ever need, Terminal Webmail is your solution to the laggy browser based experience that we've been taught to accept.

A simple Gmail API client in Python for applications.

A command-line tool to monitor Gmail messages and output them as JSON, designed for automation, monitoring, and integration with other tools.

CLI to manage emails.

This is a story of how a software company was able to start a conversation with 8x more of their users by cutting the length of their emails by 90%. You could set up a test of this method in less than an hour.

Just took note of this tool, although I didn't try it out and I would be rather scared of a script that goes through my mailbox and deletes things...

Email is unsafe and cannot be made safe. The tools we have today to encrypt email are badly flawed. Even if those flaws were fixed, email would remain unsafe. Its problems cannot plausibly be mitigated. Avoid encrypted email.
Technologists hate this argument. Few of them specialize in cryptography or privacy, but all of them are interested in it, and many of them tinker with encrypted email tools.
Most email encryption on the Internet is performative, done as a status signal or show of solidarity.

A system for automatically configuring mutt and isync with a simple interface and safe passwords.

NeoMutt is a command line mail reader based on Mutt.

It’s versatile and highly configurable.

It has lots of new features which come with documentation and sample config files.
NeoMutt has brought together lots of Mutt patches, many of which were useful, but had been abandoned.

MUA written in Ruby; specifically developed for accounts with "a lot of emails"; nice thread-based presentation.

Mail client with tons of features, customization chances, support for IMAP, POP3, multiple storage formats.

Mailboxes synchronization tool; allows to download email locally; MailDir format supported.

MUA written in Python using the NotMuch backend; MailDir format support.

Mail client which aims at being "fast, easy to use email client that is suitable for both the inexperienced email user as well as for the most demanding of power users".