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Postfix - Postfix is a mail transfer agent (MTA) that routes and delivers electronic mail.
Mailivery - Reach the Inbox, not the spam folder.
mailcow - An open source mailserver suite.
Sidemail - The simplest way to send transactional emails. Sidemail makes sending transactional emails trivial, it's perfect for side projects, MVPs or the next big thing.
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.
Postal - Open source mail delivery platform, alternative to Mailgun or Sendgrid