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Postfix - Postfix is a mail transfer agent (MTA) that routes and delivers electronic mail.
MailerQ - MailerQ is a high performance Mail Transfer Agent (MTA) designed for delivering large volume email messages at very high speeds.
mailcow - An open source mailserver suite.
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.
Mail-in-a-box - Mail-in-a-Box provides webmail and an IMAP/SMTP server for use with mobile devices and desktop mail software and also includes contacts and calendar synchronization.
GreenArrow Engine - GreenArrow Transactional Email provides a flexible and secure SMTP and API email delivery from application or website.