Mailu - Mailu is a simple yet full-featured mail server as a set of Docker images.
blat - Blat is a small, efficent SMTP command line mailer for Windows.
Microsoft Outlook - Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.
CMail - CMail is a free Windows command line mailer with advanced message formatting options.
MailEnable - MailEnable is a Windows based mail server and email server program that is packed with the state of the features and functions like antivirus and spam filtering system, webmail management system, cardDAV, CalDAV and much more.
mailsend-go - mailsend-go is a command line tool to send mail via SMTP protocol, written with golang.