License & Deployment Mix: 21 tools – 5 OSS, 10 SaaS. (OSS and SaaS counts can overlap when an open-source tool also offers a vendor-hosted edition.)

What Is Email Archiving?

Email archiving is the systematic capture, storage, indexing, and retrieval of email messages for compliance, legal discovery, and business continuity. Unlike email backup (which protects against data loss), email archiving creates a tamper-proof, searchable repository of all email communications that meets regulatory retention requirements.

This directory evaluates email archiving tools – both self-hosted and SaaS solutions. For email server platforms (sending, receiving, hosting), see Email Server Platforms. For bulk email and marketing, see Bulk Email & Marketing. For backup and disaster recovery (full system protection), see Backup & Disaster Recovery. For GRC and compliance automation, see GRC & Compliance.

Email Archiving vs Email Backup

Key Concepts

• Journal / BCC capture – the mail server sends a copy of every inbound and outbound message to the archive system in real time; this is the compliance-recommended capture method
• Milter / content filter – the archive system acts as a filter in the SMTP pipeline, capturing messages as they pass through
• IMAP sync – the archive system pulls messages from mailboxes periodically; not real-time, may miss deleted messages
• WORM storage (Write Once, Read Many) – immutable storage that prevents archived messages from being modified or deleted; required by SEC 17a-4 and other financial regulations
• Legal hold – a mechanism to preserve emails related to litigation or investigation, overriding normal retention policies
• eDiscovery – the process of searching, collecting, and producing archived emails in response to legal proceedings, regulatory audits, or FOIA requests
• Retention policies – automated rules that define how long emails are kept and when they are purged; can vary by user, department, or content
• Stub / deduplication – techniques to reduce storage by replacing archived messages in the mailbox with pointers or eliminating duplicate copies across recipients

Common integration patterns include journal/BCC, milter, IMAP sync, and transport relay.

The information on these pages was researched by a combination of human review and large language models. To suggest an addition or correction, please contact us. Prepared by Rhodium Systems Inc., author of the ResorsIT platform — a unified IT operations management platform for IT teams and MSPs that integrates a curated suite of open-source, commercial, and SaaS applications into a single system with shared identity, single sign-on, access control, and a common audit trail. Use this catalogue only as a starting point for your own research, and review any tool carefully against your own requirements before relying on it. Catalogue data version 2026.197.

Comparison

SSO / OIDC (Authentik)

Best Authentik integration: Exchange Online Archiving and Google Vault (native OIDC/SAML); OpenArchiver (native OIDC)

Compliance Features

* = Piler uses filesystem-level immutability (not native WORM); Benno uses certified WORM storage via hardware/appliance

Best compliance: Mimecast, Proofpoint, Smarsh, Global Relay, Barracuda, Jatheon (SEC 17a-4 certified, full eDiscovery)

Best OSS compliance: MailArchiva free edition (WORM, legal hold, audit trails, eDiscovery)

Search & eDiscovery

Best search: Jatheon (Elasticsearch-powered), commercial SaaS platforms (purpose-built search)

Best OSS search: Piler (Sphinx full-text), OpenArchiver (Meilisearch)

Storage Backends

Integration Methods

Best integration: Piler (journal/BCC + milter), MailArchiva (all methods), Barracuda (all methods)

Deployment & Licensing

Monitoring Integration

Best monitoring integration: Piler (syslog to Fluent Bit), Barracuda and Jatheon (syslog + SNMP), Intradyn (syslog + SNMP + health endpoint)

Pricing

Self-Hosted

SaaS

Tools

20 tools.

ArcTitan

ArcTitan by TitanHQ is a cloud email archiving solution built on AWS infrastructure. It provides WORM-compliant storage with unlimited archive capacity, legal hold, and full eDiscovery capabilities.

License: Proprietary (proprietary) · Kind: web · Deploy: saas · SSO: none

Website

Barracuda Message Archiver

Barracuda Message Archiver is an enterprise email archiving solution from Barracuda Networks, one of the largest security and data protection vendors.

License: Proprietary (proprietary) · Kind: web · Deploy: appliance · SSO: SAML

Website

Benno MailArchiv

Benno MailArchiv is a German email archiving solution designed for tamper-proof, legally compliant email retention.

License: Proprietary (proprietary) · Kind: web · Deploy: appliance · SSO: none

Website

Bichon

Bichon is a lightweight open-source email archiver written in Rust, using the embedded Tantivy search engine for full-text indexing and offering multi-account IMAP sync and a web interface.

License: AGPL-3.0-only (OSS) · Kind: web · Deploy: native, docker · SSO: none

Website · Source

Dropsuite

Dropsuite is a cloud backup and archiving platform for Microsoft 365 and Google Workspace, offering email backup, retention policies, full-text search, and export, with a multi-tenant MSP console.

License: Proprietary (proprietary) · Kind: web · Deploy: saas · SSO: none

Website

Eonvelope

Eonvelope is a Python/Django self-hostable email archiving application designed for organizations that want a familiar, well-tested web framework as the foundation for their archive.

License: AGPL-3.0-only (OSS) · Kind: web · Deploy: native, docker · SSO: none

Website · Source

Exchange Online Archiving

Exchange Online Archiving is Microsoft 365’s native email archiving, providing In- Place Archive mailboxes with auto-expanding storage plus Microsoft Purview retention, litigation hold, and eDiscovery.

License: Proprietary (proprietary) · Kind: web · Deploy: saas · SSO: none

Website

Global Relay Archive

Global Relay Archive is a communications archiving platform specializing in financial services and regulatory compliance.

License: Proprietary (proprietary) · Kind: web · Deploy: saas · SSO: none

Website

Google Vault

Google Vault is the native archiving and eDiscovery tool for Google Workspace. It provides retention rules and legal hold capabilities for Gmail, Google Drive, Chat, Meet recordings, Sites, and Groups.

License: Proprietary (proprietary) · Kind: web · Deploy: saas · SSO: none

Website

Intradyn

Intradyn provides email archiving as a physical appliance, virtual machine, or hosted cloud service. The platform offers WORM-compliant storage with legal hold, full eDiscovery, and configurable retention policies.

License: Proprietary (proprietary) · Kind: web · Deploy: saas, appliance · SSO: none

Website

Jatheon

Jatheon is an enterprise email and communications archiving platform that captures, indexes, and retains email alongside social media, instant messaging, and other communication channels.

License: Proprietary (proprietary) · Kind: web · Deploy: native, appliance · SSO: none

Website

Mail-Archiver

Mail-Archiver is a lightweight email archiving utility focused on simplicity and minimal resource consumption. It pulls messages from IMAP mailboxes and stores them on the local filesystem in standard formats (EML, Maildir).

License: MIT (OSS) · Kind: web · Deploy: native, docker · SSO: none

Website · Source

MailArchiva

MailArchiva is an email archiving platform with WORM-compliant storage, legal hold, and eDiscovery export, using Lucene full-text search and flexible SMTP, milter, and IMAP ingestion; a free edition is available.

License: Proprietary (proprietary) · Kind: web · Deploy: native, docker · SSO: none

Website

MailStore Server

MailStore Server is the most widely deployed commercial self-hosted email archiving solution, developed by MailStore GmbH (a German company now part of OpenText).

License: Proprietary (proprietary) · Kind: web · Deploy: native · SSO: none

Website

Mimecast Cloud Archive

Mimecast Cloud Archive is a leading independent cloud email archiving solution that provides SEC 17a-4 certified, WORM-compliant storage for long-term email retention.

License: Proprietary (proprietary) · Kind: web · Deploy: saas · SSO: none

Website

OpenArchiver

OpenArchiver is an open-source email archiving platform built with TypeScript and SvelteKit, focused on IMAP sync for cloud mailboxes, with full-text search, retention policies, and native OIDC.

License: AGPL-3.0-only (OSS) · Kind: web · Deploy: native, docker · SSO: none

Website · Source

Piler

Piler is the most mature open-source email archiving solution available. It has been in active development for over a decade and has a well-established community of users and contributors.

License: GPL-3.0-only (OSS) · Kind: web · Deploy: native, docker · SSO: none

Website · Source

Proofpoint Archive

Proofpoint Archive is an enterprise-grade cloud email archiving solution with SEC 17a-4 certification and WORM-compliant storage.

License: Proprietary (proprietary) · Kind: web · Deploy: saas · SSO: none

Website

Smarsh

Smarsh is a communications archiving platform specializing in financial services compliance. It provides SEC 17a-4, FINRA, and MiFID II certified archiving with WORM-compliant storage.

License: Proprietary (proprietary) · Kind: web · Deploy: saas · SSO: none

Website

VaultMe

VaultMe is a cloud-based email migration and archiving service designed for one-time mailbox transfers between cloud email providers.

License: Proprietary (proprietary) · Kind: web · Deploy: saas · SSO: none

Website