Boundary vs openarchiver

Boundary and Open Archiver are both open-source, self-hostable infrastructure tools, but they solve unrelated problems. Boundary is HashiCorp's identity-based…

Best for Boundary: Security and infrastructure teams that need identity-based, VPN-less access to servers and systems, particularly those already managing infrastructure as code with Terraform.
Best for openarchiver: IT and compliance teams that need to archive and full-text search Microsoft 365, Google Workspace, or IMAP mailboxes for backup, legal hold, and eDiscovery purposes, including importing historical PST and EML files.

At a Glance

 Boundaryopenarchiver
Primary categorySecuritySecurity
RatingNot documentedNot documented
Pricing modelOpen Source / Usage-basedOpen Source
Starting priceFree (self-managed Community Edition)Free (self-hosted)
Free planYesNot documented
Free trialNot documentedNot documented
PlatformsNot documentedNot documented
Team collaborationNot documentedNot documented
AI featuresNot documentedNot documented
Public APIYesNot documented

Key Differences

Core Purpose

Boundary: Boundary provides identity-based access management, enabling privileged sessions to infrastructure based on user and application identity without exposing networks or credentials.

openarchiver: Open Archiver captures, stores, and indexes email for backup, compliance, and eDiscovery, with full-text search across archived messages.

These solve entirely different problems: controlling who can reach infrastructure versus retaining and searching historical records.

Data Source Connections

Boundary: Boundary connects to infrastructure resources (hosts) via automated service discovery; it does not connect to email platforms.

openarchiver: Open Archiver connects directly to Microsoft 365, Google Workspace, and generic IMAP servers, plus supports PST and EML file import for historical archives.

Buyers need the tool that actually connects to the systems they're trying to secure or archive.

Deployment Model

Boundary: Boundary offers a self-managed Community edition plus a managed HCP Boundary option with a free trial; pricing beyond the trial is not published.

openarchiver: Open Archiver is a self-hosted platform under a freemium pricing model, with no starting price or managed hosting plans documented.

Understanding whether a managed option exists, and its cost, affects operational overhead decisions.

Auditability

Boundary: Boundary provides session auditing with visibility into session metrics, events, logs, and traces, exportable to monitoring tools.

openarchiver: Open Archiver provides full-text search across archived email specifically for compliance and eDiscovery use cases.

Both support audit-related use cases, but for entirely different record types: access events versus email content.

Infrastructure-as-Code Support

Boundary: Boundary has full Terraform provider support, letting teams define access policies and configuration as code.

openarchiver: Open Archiver does not document Terraform or infrastructure-as-code support.

Terraform integration matters to teams that manage all infrastructure configuration declaratively.

Feature-by-Feature

Core Function

FeatureBoundaryopenarchiver
Identity-based infrastructure accessAvailableUnavailable
Email archiving and backupUnavailableAvailable
SSH credential injectionAvailableUnavailable
Full-text search of archived contentNot documentedAvailable

Deployment & Data Sources

FeatureBoundaryopenarchiver
Free self-hosted editionAvailableAvailable
Managed/cloud optionAvailableNot documented
Microsoft 365 / Google Workspace connectorsUnavailableAvailable
PST/EML historical importUnavailableAvailable
Terraform provider supportAvailableNot documented

Compliance & Auditing

FeatureBoundaryopenarchiver
Session auditing (logs, metrics, traces)AvailableUnavailable
eDiscovery / compliance archivingUnavailableAvailable
Export to monitoring toolsAvailableNot documented

Pricing Compared

Starting price reflects the lowest paid tier, not the full cost for every team size or usage level.

Boundary

Community Edition — Free N/A
HCP Boundary (Standard/Plus) — Custom (usage-based) Metered per authenticated user/month
Boundary Enterprise — Custom Annual contract

openarchiver

Self-Hosted Community — Free N/A

Pros & Cons

Boundary

Pros

  • Free, open-source Community Edition for self-managed use
  • Removes need for traditional VPN network exposure
  • Deep integration with Vault, Terraform, and the wider HashiCorp ecosystem
  • Session recording supports compliance and audit requirements

Cons

  • Operational complexity to self-host and integrate with existing infrastructure
  • Advanced features (recording, HA, enterprise governance) require paid Enterprise or HCP tiers
  • HCP Boundary per-user pricing is not publicly listed
  • Best value requires familiarity with the broader HashiCorp toolchain

openarchiver

Pros

  • Fully open source with no license fee for the core platform
  • Full data ownership and sovereignty since everything is self-hosted
  • Tamper-evident storage and audit trails suited to compliance and eDiscovery needs
  • Supports major mail platforms including Google Workspace, Microsoft 365, and IMAP
  • Portable .eml storage format avoids vendor lock-in

Cons

  • Requires self-hosting expertise and infrastructure to operate reliably
  • No official hosted cloud offering or published SaaS pricing tier
  • Smaller company and community compared to established commercial archiving vendors
  • Enterprise support depends on a partner program rather than a large in-house support team
  • Newer project with a shorter track record than long-established archiving suites

Use Cases

Choose Boundary: Security and infrastructure teams that need identity-based, VPN-less access to servers and systems, particularly those already managing infrastructure as code with Terraform.
Choose openarchiver: IT and compliance teams that need to archive and full-text search Microsoft 365, Google Workspace, or IMAP mailboxes for backup, legal hold, and eDiscovery purposes, including importing historical PST and EML files.
Need both: A security-conscious organization could deploy Boundary to control identity-based access to its self-hosted servers, including the server running Open Archiver, while relying on Open Archiver itself to meet email retention and eDiscovery obligations; Boundary secures the access layer around whatever infrastructure an organization runs, which can include an email archive.

Boundary

  • Zero-trust infrastructure access — Platform engineering teams replace VPN-based access with identity-based, least-privilege connections to cloud infrastructure.
  • Auditable privileged access — Security teams use session recording and role-based policies to grant and audit access to sensitive systems and databases.
  • Dynamic cloud resource access — Organizations with frequently changing cloud infrastructure use dynamic host catalogs to keep access policies current automatically.

openarchiver

  • Regulatory email retention — Meet legal and regulatory requirements to retain and produce email records for a defined retention period.
  • Litigation holds and eDiscovery — Search and export tamper-evident email archives with a verifiable chain of custody during legal disputes.
  • Self-hosted mailbox migration and backup — Archive mailboxes before decommissioning accounts or migrating between email platforms, preserving full-text searchable history.

Frequently Asked Questions

Do Boundary and Open Archiver solve the same problem?

No. Boundary is an identity-based access management tool for securely reaching infrastructure, while Open Archiver is an email archiving platform for backup, compliance, and eDiscovery. They are not substitutes for each other.

Can Boundary archive emails?

No, this is not a documented capability of Boundary; its features are focused on identity-based sessions, service discovery, and SSH credential injection for infrastructure access.

Can Open Archiver manage infrastructure access?

No, Open Archiver's documented features are limited to email connectors (Microsoft 365, Google Workspace, IMAP) and PST/EML import for archiving purposes.

Is either tool free to self-host?

Yes, both offer free self-hosted options: Boundary has a self-managed Community edition, and Open Archiver is self-hosted under a freemium pricing model.

Does Open Archiver connect to Microsoft 365?

Yes, along with Google Workspace and generic IMAP servers, plus it supports importing existing PST and EML archives without a live mailbox connection.

Is pricing published for either tool beyond free trials?

No. Boundary's HCP managed offering has a free trial but pricing beyond that isn't published, and Open Archiver has no starting price or pricing plans documented.

Read the full Boundary review · Read the full openarchiver review