OpenArchiver

Overview

OpenArchiver is a free, open-source platform designed to archive, store, index, and search email communications from providers such as Google Workspace, Microsoft 365, and any IMAP server. It's focused on secure, sovereign email retention with powerful full-text search, compliance tools, and flexible storage backends for legal and audit needs.

Key features

• Universal email ingestion
• IMAP/Google Workspace/M365 support
• PST & Mbox import
• Encrypted storage at rest
• Full-text search
• Attachment indexing
• Deduplication
• Compliance rules
• Retention policies
• Immutable audit logs
• Thread discovery
• Pluggable storage backends (local/S3)
• Role-based access
• Web dashboard
• API access