ERA Mail ServerSovereign integrated mail backend

Native on-prem mail and collaboration backend. Integrated Rust + Go stack — single product, air-gap ready. Client compatibility is implemented on the server via Autodiscover, EWS, CalDAV, CardDAV, and ActiveSync — no desktop plugins or client-side connectors.

Outlook & mobile parity (server-side)

• Autodiscover + EXCH — Outlook uses standard EXCH Autodiscover profile; no client plugin.
• EWS subset — mail, calendar, contacts, notes/tasks (documented subset).
• CalDAV — full calendar read/write (Apple Calendar, Thunderbird).
• CardDAV — corporate contacts (gov pilot scope).
• ActiveSync subset — iOS/Android mobile sync (gov pilot scope).
• SMTP/IMAP + TLS — standard clients and mass deployment.

Key capabilities

• Integrated mail core — single product, air-gap ready.
• ClickHouse audit — mandatory SIEM trail (ERA Control integration).
• Offline Ed25519 licensing; scale target 60,000+ mailboxes.
• Zero-Touch Autodiscover for Outlook and mobile.

Technical architecture

• Rust — era-mail-core: SMTP/IMAP delivery.
• Go — mail-api: Autodiscover, EWS, CalDAV, CardDAV, ActiveSync adapters.
• Integrated multi-protocol design — native ERA code.

Co-editing attachments requires ERA Office (separate license). Hybrid transition: ERA Mail Connect.