https://www.proofpoint.com/de/products/email-protection/open-source-email-solution
Sendmail: Open-Source-Email-Server | Proofpoint DE
Learn how the sendmail Sentrion platform helps organizations that are using open source for large complex environments and need an enterprise platform that...
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https://modoboa.org/en/
Modoboa, Open Source Email Server
Modoboa is an open source email server including a modern and simplified Web User Interface.
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https://www.hmailserver.com/
hMailServer - Free open source email server for Microsoft Windows
hMailServer - Free open source email server for Microsoft Windows
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https://forwardemail.net/en/self-hosted
Self-Hosted Email Server - Complete Open Source Setup Guide
Deploy your own email server with Forward Email's open-source code. Docker, Kubernetes, and bare-metal installation guides. Full control over your email...
self hosted emailopen sourcesetup guideservercomplete