OpenArchiverAn open-source platform for legally compliant email archiving.

OpenArchiver

OpenArchiver is a self-hosted, open-source platform for securely archiving, indexing, and searching emails from multiple providers including Gmail, Microsoft 365, IMAP servers, and PST files. It eliminates vendor lock-in by providing a sovereign solution that maintains tamper-proof records of your communication history with built-in legal compliance and encryption.

Key Features

• Universal Email Ingestion: Connect to Google Workspace, Microsoft 365, generic IMAP servers, PST files, and other sources for bulk imports and real-time synchronization
• Secure Storage & Encryption: Emails stored in standard .eml format with encryption at rest, deduplication, compression, and support for local or S3-compatible storage backends
• Full-Text Search & eDiscovery: High-performance indexing of email content and attachments with thread discovery and conversation context
• Legal Compliance & Auditing: File hash verification, integrity reports, granular retention policies, and immutable audit trails for regulatory requirements

Use Cases

• Litigation Support: Maintain legally compliant communication records with integrity verification and audit trails for eDiscovery
• Regulatory Compliance: Meet data retention requirements with customizable policies and comprehensive audit logging
• Data Sovereignty: Keep complete control over archived emails with self-hosted deployment and no vendor dependencies

Who Is It For

OpenArchiver is designed for organizations, enterprises, and legal teams that need secure, compliant email archiving with full control over their data. It's ideal for businesses requiring eDiscovery capabilities, regulatory compliance, and protection against vendor lock-in.