List of Top Free Open Source & Self Hosted Application for Communication - Email - Mail Delivery Agents

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Mail Delivery Agents (MDAs) – IMAP/POP3 server software.

Cyrus IMAP – Email (IMAP/POP3), contacts and calendar server. BSD-3-Clause-Attribution C
Dovecot – IMAP and POP3 server written primarily with security in mind. MIT/LGPL-2.1 C
MailForm – Lightweight self-hosted open source alternative to Formspree and SendGrid. Apache-2.0 Nodejs
Piler – Feature-rich open source email archiving solution. GPL-3.0 C
Stalwart JMAP – JMAP and IMAP server designed to be secure, fast, robust and scalable. AGPL-3.0 Rust

Ashwani K

👤 About the Author

Ashwani is passionate about DevOps, DevSecOps, SRE, MLOps, and AiOps, with a strong drive to simplify and scale modern IT operations. Through continuous learning and sharing, Ashwani helps organizations and engineers adopt best practices for automation, security, reliability, and AI-driven operations.

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