OpenSMTPD
self-hosted, mail agents

OpenSMTPD is a secure and lightweight SMTP server implementation developed as part of the OpenBSD project. It aims to provide a simple and reliable mail transfer solution while prioritizing security. OpenSMTPD offers features such as support for multiple domains, virtual hosting, and authentication mechanisms. With a focus on security, stability, and ease of configuration, it serves as a robust choice for setting up email services on Unix-like operating systems.

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