Hermes Secure Email Gateway

Self-hosted secure email gateway and mail server, an alternative to Proofpoint.

PlatformWebfreemium

Hermes Secure Email Gateway is a free, open-source secure email gateway and mail server, deployable in front of Microsoft 365, Google Workspace, or Exchange, as a full mail server, or in hybrid mode. It offers spam and malware filtering, S/MIME and PGP encryption, DKIM/DMARC/ARC enforcement, and mailboxes, with a paid Pro tier adding time-of-click link protection comparable to Proofpoint or Mimecast. It's aimed at organizations wanting enterprise-grade email security on infrastructure they control.

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