openarchiver review 2026: self-hosted email archiving features, integrity reporting, full-text search, deployment options, pricing, and top alternatives.
OpenArchiver is an open-source, self-hosted email archiving platform designed for organizations that need to retain and search email for legal, compliance, or eDiscovery purposes without relying on a third-party cloud archiving vendor. It is built and maintained by LogicLabs OU, an Estonia-based software company.
The platform connects directly to Google Workspace, Microsoft 365, PST files, and generic IMAP mailboxes to bulk-import existing mail and then keep archives synchronized in real time as new messages arrive, keeping a permanent, tamper-evident record of an organization's communication history.
Emails are stored in the open, portable .eml format with deduplication and compression, and encrypted at rest, avoiding the vendor lock-in common with proprietary archiving formats. An Integrity Report verifies each archived message is an unaltered original, and an immutable audit trail records every access and administrative action for compliance reporting.
Under the hood, OpenArchiver runs on Meilisearch for full-text search across both email bodies and attachments, PostgreSQL for metadata and audit logs, and BullMQ on Redis for background processing, and it supports storage on local disks or S3-compatible object storage such as AWS S3 or MinIO.
OpenArchiver is free and open source; there is no license fee to download, deploy, and run the platform. Costs are limited to the infrastructure an organization already owns or provisions, such as servers, storage, and object storage capacity.
For organizations that want implementation help, LogicLabs OU runs a partner program offering deployment and support services, though these are arranged directly rather than through a published tiered pricing page.
Yes, OpenArchiver is open source and free to self-host; costs are limited to the infrastructure you run it on.
It connects to Google Workspace, Microsoft 365, PST files, and any generic IMAP-enabled mailbox for both bulk import and ongoing synchronization.
Yes, it provides an Integrity Report to verify archived files are unaltered originals and an immutable audit trail logging all access and system activity.
Emails are stored in the standard .eml format on local filesystem storage or S3-compatible object storage such as AWS S3 or MinIO, with deduplication, compression, and encryption at rest.
OpenArchiver is developed by LogicLabs OU, a software company based in Tallinn, Estonia.
Yes, LogicLabs OU offers a partner program for organizations that want implementation and support assistance beyond the open-source community.
It uses Meilisearch for full-text search across email bodies and attachments, with PostgreSQL handling metadata and audit logs.