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iRedMail - A fully fledged, free email server solution, an open source project (GPL v2).
Qualys - Qualys helps your business automate the full spectrum of auditing, compliance and protection of your IT systems and web applications.
Zimbra - Zimbra is trusted by over 500 million users to increase productivity with a complete set of collaboration tools while maintaining total control over security and privacy.
Trend Micro Deep Security - Excellent hybrid cloud security doesn't require your business to sacrifice operational performance. Trend Micro lets you keep business moving securely.
mailcow - An open source mailserver suite.
Google Cloud Platform Security Overview - Cloud Workload Protection Platforms