Pistachio Email Templates - Delicious newsletter templates built for automation
Halon MTA - Scriptable and scalable SMTP server and email framework designed for service providers.
SaaS Email Templates - Responsive HTML email templates for SaaS startups
KumoMTA - KumoMTA is the world's first Open-Source MTA designed from the ground-up for large-volume senders. Get a fast, flexible, supported solution.
Templates by Email Monster - Hundreds of free, responsive email templates. Pick and edit.
MailerQ - MailerQ is a high performance Mail Transfer Agent (MTA) designed for delivering large volume email messages at very high speeds.