Hermes Secure Email Gateway is a secure email gateway and mail server that protects inbound and outbound email against spam, viruses, and malware.
It combines filtering, encryption, archiving, mailbox hosting, collaboration services, and identity management within a unified web administration interface.
Hermes combines these technologies under one unified web-based administration console for easy management of your organization’s inbound and outbound email, mailbox users, encryption keys, and authentication policies. End users get a self-service portal for managing their own signatures, sieve rules, vacation messages, app passwords, and mobile-device profiles.
The Community Edition is free and open source software.
Key Features
- Spam, virus, and malware filtering using SpamAssassin, ClamAV, and Amavisd-new.
- SMTP TLS, S/MIME, PGP, and encrypted PDF email delivery.
- Encryption for email in transit and at rest.
- Email archiving.
- Dovecot mailbox hosting with quotas, aliases, and shared folders.
- Sieve filtering rules and vacation auto-replies.
- Webmail, file synchronisation, calendars, and contacts through Nextcloud.
- OpenLDAP directory services and Authelia single sign-on.
- Multi-factor authentication using TOTP, WebAuthn, and Duo Push.
- SPF, DKIM, DMARC, and ARC email authentication.
- Self-service management of signatures, app passwords, filtering rules, and device profiles.
- Web-based administration of email, users, encryption keys, and authentication policies.
Website: github.com/deeztek/Hermes-Secure-Email-Gateway
Support:
Developer: Dino Edwards
License: GNU Affero General Public License v3.0

Hermes Secure Email Gateway is written primarily in JavaScript. Learn JavaScript with our recommended free books and free tutorials.
This program was suggested by Dino Edwards who completed the software form.
Related Software
| Anti-Spam Tools | |
|---|---|
| SpamAssassin | Perl-based spam filter using text analysis |
| Proxmox Mail Gateway | Email security solution |
| Bogofilter | Mail filter that classifies mail as spam or ham (non-spam) |
| ASSP | Perl based transparent SMTP proxy server |
| Rspamd | Advanced spam filtering system |
| MailScanner | Virus scanner and spam detector |
| Pyzor | Spam-blocking networked system |
| Scrollout F1 | Highly configurable email gateway for multiple domains and servers |
Read our verdict in the software roundup.
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