CMail is a command line e-mail sending tool. It was originally developed to assist with testing mail server and content analysis software. As a result, CMail provides many more message formatting and SMTP session control options than similar software.
mailsend-go - mailsend-go is a command line tool to send mail via SMTP protocol, written with golang.
GoZen.io - GoZen Growth is a user-friendly email marketing software with outcome-driven and industry-specific email templates. Get started and grow your business now.
blat - Blat is a small, efficent SMTP command line mailer for Windows.
Brevo - Innovative online Email Marketing solution to manage your contacts, create & send your newsletters and track your results. More than 80 000 clients. Best prices and attractive features.
sendEmail - sendEmail is a lightweight, command line SMTP email client.
MailChimp - MailChimp is the best way to design, send, and share email newsletters.