ArcTitan
subscription
Cloud email archiving solution with fast search, compliance tools, and Office 365 integration.
Open source email archiving software to evaluate in 2026
Open source email archiving software gives teams full code access, no per-user licensing, and the freedom to self-host, but operational cost replaces license cost. These are the open source options in this category, followed by the full list for comparison.
No product in this category matches the open source filter yet, so all 7 are listed below.
Back to all Email Archiving Software tools, or browse the full software directory. You can also run head-to-head comparisons or read about our review methodology.
For background on scoring, see how rankings work. Our editorial articles add deeper analysis, the glossary clarifies vendor terminology, and our calculators help estimate ROI before the shortlist narrows further.
All email archiving software
Nothing in this category met the open source filter, so the full email archiving software category is listed here instead.
Barracuda Email Archiver
subscription
Cloud and on-premises email archiving for compliance, eDiscovery, and long-term retention.
Intradyn
subscription
Email archiving appliance and cloud service for regulated industries with tamper-proof storage.
Jatheon
subscription
Cloud and on-premises email archiving platform for compliance, eDiscovery, and data governance.
MailStore
subscription
Email archiving software for small and mid-size businesses with fast search and legal hold.
Mimecast
subscription
Cloud email management platform with archiving, security, and continuity for enterprise email.
Proofpoint Archive
subscription
Enterprise information archiving for email, social media, and instant messaging with eDiscovery.
Common questions about open source email archiving software
Is open source email archiving software really free?
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The license is free, but hosting, maintenance, patching, and upgrades replace the vendor's license fee. Teams without dedicated ops resources often spend more on self-managed open source than on a managed commercial alternative.
When should I choose open source over commercial email archiving software?
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Open source is strongest when you need full code control, on-premises deployment for compliance, or want to avoid vendor lock-in. It is weaker when your team lacks the ops capacity to maintain, patch, and scale the deployment.
What should I check before deploying open source email archiving software?
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Check community activity (commits, issues, and releases in the last six months), commercial support options, documentation quality, and the total operational burden against a managed alternative. A dormant project with no commercial backing is a risk.