Open Archiver

A secure, sovereign, and open-source platform for email archiving.

Open Archiver provides a robust, self-hosted solution for archiving, storing, indexing, and searching emails from major platforms, including Google Workspace (Gmail), Microsoft 365, PST files, as well as generic IMAP-enabled email inboxes. Use Open Archiver to keep a permanent, tamper-proof record of your communication history, free from vendor lock-in.

Key features:

• Universal Ingestion: Connect to any email provider to perform initial bulk imports and maintain continuous, real-time synchronization. Ingestion sources include: IMAP connection, Google Workspace, Microsoft 365, PST files, Zipped .eml files, Mbox files.
• Secure & Efficient Storage: Emails are stored in the standard .eml format. The system uses deduplication and compression to minimize storage costs. All files are encrypted at rest.
• Pluggable Storage Backends: Support both local filesystem storage and S3-compatible object storage (like AWS S3 or MinIO).
• Powerful Search & eDiscovery: A high-performance search engine indexes the full text of emails and attachments (PDF, DOCX, etc.).
• Thread discovery: The ability to discover if an email belongs to a thread/conversation and present the context.
• Compliance & Retention: Define granular retention policies to automatically manage the lifecycle of your data. Place legal holds on communications to prevent deletion during litigation (TBD).
• File Hash and Encryption: Email and attachment file hash values are stored in the meta database upon ingestion, meaning any attempt to alter the file content will be identified, ensuring legal and regulatory compliance. Each archived email comes with an "Integrity Report" feature that indicates if the files are original.
• Comprehensive Auditing: An immutable audit trail logs all system activities, ensuring you have a clear record of who accessed what and when.