Listmonk - Send e-mail campaigns from a powerful dashboard. High performance and features packed into one app.
Thunderbird - Thunderbird is a free email application that's easy to set up and customize - and it's loaded with great features!
Sendy - Sendy is a self hosted newsletter app that sends emails 100x cheaper via Amazon SES
Microsoft Outlook - Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.
MailChimp - MailChimp is the best way to design, send, and share email newsletters.
eM Client - eM Client is a fully-featured email client for Windows and macOS with a clean and easy-to-use interface. eM Client also offers features for calendars, tasks, contacts, notes, and chat.