Sup is an office and productivity app that helps businesses streamline their workflows and keep teams connected. It provides a single, centralized hub for all of your team’s tasks, projects, and collaboration. It helps teams stay organized, on top of deadlines, and ensure everyone is on the same page. It also helps to ensure that tasks are completed on time and projects are progressing according to plan. Sup offers a range of features that allow teams to communicate, manage tasks, and collaborate on projects. It has task management tools such as task boards and kanban boards to help teams break down complex tasks into small manageable chunks. It also has project management tools such as Gantt charts and timelines that help teams keep track of their progress. Additionally, Sup includes collaboration features such as comment threads and file sharing, allowing teams to work together effectively. Finally, it also has a built-in chat function, allowing teams to communicate quickly and easily.
The discontinued Opera Mail is no longer updated and is no longer supported, but the latest version, 1.0.1044, released in February 2016, can still be downloaded from the official website.
mutt is a command line email client.
This is really the only GUI MUA I can tolerate, and it does everything I need. A nice bonus is the ManageSieve add-on, to handle filters on the mail server.