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Piler

Open-source, self-hosted email archiving software with full-text search and retention rules, plus a paid Enterprise edition.

Our take: Piler does one job well: it captures your company's email, stores it once, and makes it searchable for audits and lost-message requests.

Best forSelf-hosted email archives
ReviewedPricing: Freemium
6.6 out of 105 criteria · see breakdown
Try PilerFree; Enterprise from EUR 400 first year

Piler is free, open-source email archiving software you host yourself, also known as mailpiler. It stores mail with deduplication and encryption and makes it searchable for compliance. A paid, also self-hosted Piler Enterprise edition starts at EUR 400 for the first year for up to 10 users.

The bottom line

A strong free choice for IT teams that can self-host; others should trial Enterprise or use a hosted archive.

Our score

Reviewed by the Conversion Gems editorial team. Hover a facet to focus it; click to pin.Tap a facet to focus it.

What it is, and why we rate it

One line each. Open a row for detail.

What it really isFree, self-hosted email archiving software with a paid Enterprise edition.
Our takePiler does one job well: it captures your company's email, stores it once, and makes it searchable for audits and lost-message requests.
The open-source edition is free and still maintained, with a release in June 2026. The trade-off is effort. You need a server and someone comfortable with Linux, and help comes from GitHub unless you buy Enterprise.
Why we rate itIt gives you a full email archive with search, retention and encryption at no license cost.
The catchYou host and maintain it yourself, and free support is community-only.

Best / not good for

Best for
  • IT teams that can run Linux servers
  • Companies with email retention rules
  • Budget-limited organizations
Not good for
  • Teams with no server administrator
  • Anyone who wants a fully hosted archive
  • Buyers who need US-dollar contracts and long vendor support
Trade-offs

Friction report

Trade-offs to know before signing up.

  1. Time to value
    High: install on a server or Docker, configure mail capture and secure it.
  2. Scale breakpoint
    Large archives need more servers; on Enterprise each worker node adds a full license fee.
  3. Walled garden
    Low: open source, and Enterprise says data exports in standard EML format.
Still a fit?
If none of these block you, start on the free plan.
Try Piler

Piler editions and pricing

Edition / usersFirst yearYearly renewalNotes
Open sourceFreeFreeGPLv3, self-hosted, community support
Enterprise 1-10EUR 400EUR 1501 server, unlimited emails, all features
Enterprise 11-50EUR 800EUR 2501 server
Enterprise 51-99EUR 1,200EUR 4001 server
Enterprise 100-199EUR 1,500EUR 5001 server
Enterprise 200-299EUR 2,000EUR 6501 server

From Piler's GitHub license and Piler Enterprise's pricing page, checked 4 October 2026. Extra worker nodes cost the same as the base license; frontend nodes EUR 300/year.

Frequently Asked Questions

What is Piler?

Piler, also called mailpiler, is open-source email archiving software. It captures and stores a company's email with deduplication and encryption, and lets users search the archive for compliance and recovery.

Is Piler free?

Yes. The open-source edition is free under the GPLv3 license. Piler Enterprise is paid, from EUR 400 for the first year and EUR 150 a year after for up to 10 users (checked 4 October 2026).

How much does Piler Enterprise cost?

First year and yearly renewal per server: 1-10 users EUR 400/150, 11-50 EUR 800/250, 51-99 EUR 1,200/400, 100-199 EUR 1,500/500, 200-299 EUR 2,000/650 (checked 4 October 2026).

Can Piler archive Office 365 or Gmail?

Yes. The open-source project lists Office 365 and Google Apps imports, plus IMAP, POP3 and EML or Maildir files.

Is there a Piler free trial?

Piler Enterprise has a 30-day free trial with no credit card. The open-source edition is free to download from GitHub (checked 4 October 2026).

Piler alternatives

Other backup and email security tools in our directory:

Showing 1–3 of 4
Sources checked October 4, 2026: Piler open-source site, Piler on GitHub, Piler license (GPLv3), Piler Enterprise, Piler Enterprise pricing.

Conversion Gems independently reviews every tool.

Tags

#EmailArchiving#OpenSource#Compliance

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