blat - Blat is a small, efficent SMTP command line mailer for Windows.
sendEmail - sendEmail is a lightweight, command line SMTP email client.
CMail - CMail is a free Windows command line mailer with advanced message formatting options.
mailsend-go - mailsend-go is a command line tool to send mail via SMTP protocol, written with golang.
Sendmail - Sendmail is a general purpose internetwork email routing facility that supports many kinds of...
Mailercloud - Mailercloud is a cloud-based email marketing tool, enriched with great features, which help users to build strong relationships with their audience. It is ideal for those who wish to improve engagement rate and conversions.