CMail - CMail is a free Windows command line mailer with advanced message formatting options.
sendEmail - sendEmail is a lightweight, command line SMTP email client.
mailsend-go - mailsend-go is a command line tool to send mail via SMTP protocol, written with golang.
CheFSender - CheFSendeR is a simple command line tool to send emails.
Mailer - Free utility to send emails from the command line. No Installation. All contained in one file.
sSMTP - sSMTP is a simple MTA to deliver mail from a computer to a mail server.