Infrastructure●●Solid
Posthorn, self-hosted mail without the mail server
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Solve My ProblemCozy
craigmccaskill
83601mo ago
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GitHub Repository
Hermes Secure Email Gateway is a Free Open Source Secure Email Gateway and Email Server
107 starsJavaScript
Hermes SEG – Self-hosted, open-source secure email gateway
by stylized8629·Jul 22, 2026·1 point·1 comment
AI Analysis
●●SolidSolve My Problem
One Docker Compose file replaces Proofpoint inbound-link defense for self-hosted teams.
Strengths
- •Single stack combines mail server, Nextcloud, and SSO with one Docker Compose file.
- •Pro edition adds time-of-click link protection typically found in enterprise tools.
- •Deploys as gateway in front of Microsoft 365 or as full standalone mail server.
Weaknesses
- •Enterprise email security is crowded with established players like Mimecast and Proofpoint.
- •Self-hosted email maintenance remains operationally heavy despite simplified deployment.
Category
Target Audience
Sysadmins and IT teams needing self-hosted email security
Similar To
Proofpoint · Mimecast · Mail-in-a-Box
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