Open Archiver
Archives email from Google Workspace, Microsoft 365, IMAP inboxes, PST and eml files into a searchable, tamper-proof store with retention policies and audit logs.
About
Open Archiver captures mail from Google Workspace, Microsoft 365, generic IMAP inboxes, PST files, zipped .eml files, and mbox files, and keeps a permanent, tamper-proof record of your communication history. It stores messages in the standard .eml format with deduplication, compression, and encryption at rest.
It suits organizations that need legally compliant archiving without vendor lock-in. A web interface provides search, retention policies, integrity reports, and an audit trail.
Key features
- Bulk imports and continuous real-time sync from IMAP, Google Workspace, and Microsoft 365.
- Imports PST files, zipped .eml files, and mbox files.
- Stores email as .eml with deduplication, compression, and encryption at rest.
- Local filesystem or S3-compatible storage backends, including AWS S3 and MinIO.
- Full-text search across emails and attachments such as PDF and DOCX.
- Thread discovery shows the conversation an email belongs to.
- Retention policies manage data lifecycle, and legal holds are planned.
- File hashes, integrity reports, and an immutable audit trail support compliance.
Requirements
Docker and Docker Compose. At least 4GB of RAM, or 2GB if you use external PostgreSQL, Redis (Valkey), and Meilisearch instances. The stack runs PostgreSQL for metadata, Meilisearch for search, and Redis or Valkey for the job queue.
Ways to run it
- Docker Compose