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Mailcow Review

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Should I use Mailcow?

mailcow: dockerized — open-source, full-featured self-hosted mail server suite with webmail - mailcow.email

· 1 month ago

Buy if you're a self-hoster or small org that wants mail sovereignty, can run Docker, and will patch regularly. Skip it if you lack Linux admin time or can't risk deliverability and security upkeep.

Confidence

Medium. Based on ~20 public sources: Reddit and blog reviews, CVE databases, pricing analyses, and official docs.

Ratings

  • Value for money
  • Ease of use
  • Feature depth
  • Support qualityCommunity forum and docs only; quality unverified
  • Security posture

Pricing

$0

Open source (self-host)

ModelNot disclosed
Monthly feesNot disclosed
HardwareNot disclosed
Free tierYes
Managed (via providers)~$49/yr+ class offerings

Best for

  • Self-hosters and homelab users
  • Privacy- and sovereignty-focused small orgs
  • Admins comfortable with Docker
  • Teams escaping Google Workspace

Not for

  • Teams with no Linux/Docker admin capacity
  • Businesses where email downtime is unacceptable
  • Solo users who just need an inbox
  • Anyone unwilling to manage IP reputation and patching

Gotchas - check before you buy

high

"Free" isn't free: expect $170-400/yr VPS plus hours of admin time

high

Self-hosted deliverability is hard; bad IP reputation can blacklist your mail

high

Frequent security releases require prompt patching or you're exposed

medium

Safe Browsing wrongly flagged webmail pages, scaring users (Sept 2025)

Pros and cons

Pros

  • Full-featured self-hosted mail with webmail and admin UI
  • Free and open source with 13,000+ GitHub stars
  • Dockerized install simplifies deployment
  • Recommended pick in self-hosted mail comparisons
  • Value emerges at scale versus per-seat managed mail

Cons

  • Recurring CVEs including RCE, XSS, and auth bypass
  • Resource-hungry on the host server
  • Overkill for simple personal mail needs
  • Hidden TCO: VPS fees plus ongoing admin time
  • Google Safe Browsing flagged webmail pages in 2025

Sources & method

- 10 sources - Pattern of CVEs 2024-2026 including RCE, SSTI, XSS, and auth bypass; fine if patched fast, risky if neglected.

official x1review x5security x3news x1
  • CVE-2026-40873: XSS vulnerability, Cross-site scripting in mailcow dockerized, published April 2026.
  • CVE-2026-40874: auth bypass, Authentication bypass in mailcow dockerized, published April 2026.
  • Remote code execution (SonarSource, 2024), RCE via unsanitized error messages; required fixes from the mailcow team.
  • CVE-2025-53909: server-side template injection, SSTI flaw disclosed July 2025.

Key stats

  • Value for money: 4/5

    Rating

  • $0

    Starting price

  • 10

    Sources

  • Analyzed

  • Value for money: 4/5. Free core; real cost is VPS and admin hours
  • Ease of use: 2/5. Docker helps, but setup and upkeep are involved
  • Feature depth: 5/5. Full suite: webmail, admin UI, SOGo groupware
  • Support quality. Community forum and docs only; quality unverified
  • Security posture: 2/5. Repeated CVEs: RCE, XSS, auth bypass
  • Free, open source License GitHub-sponsored project
  • $170-400/yr True annual cost VPS plus admin time (2026 estimate)
  • 13,000+ GitHub stars Active community
  • 5+ Tracked CVEs 2024-2026, incl. RCE and auth bypass

Pricing

Open source (self-host)

$0

  • Full mailcow suite
  • You supply VPS ($170-400/yr)
  • You do all admin and patching

Managed (via providers)

~$49/yr+ class offerings

  • Elest.io, AWS Marketplace, hosting VPS partners
  • Vendor handles operations

Security

Pattern of CVEs 2024-2026 including RCE, SSTI, XSS, and auth bypass; fine if patched fast, risky if neglected.

  • CVE-2026-40873: XSS vulnerabilityCross-site scripting in mailcow dockerized, published April 2026.
  • CVE-2026-40874: auth bypassAuthentication bypass in mailcow dockerized, published April 2026.⁷
  • Remote code execution (SonarSource, 2024)RCE via unsanitized error messages; required fixes from the mailcow team.⁶
  • CVE-2025-53909: server-side template injectionSSTI flaw disclosed July 2025.
Full analysis

Based on ~20 public sources: Reddit and blog reviews, CVE databases, pricing analyses, and official docs.

Powerful free self-hosted mail server — great with Docker skills and time; overkill if you just want email that works.

Methodology

Based on ~20 public sources: Reddit and blog reviews, CVE databases, pricing analyses, and official docs.

Read how a report is made.

Sources

  1. Do you run MailCow now? : r/selfhostedreddit.com
    review
  2. selfhosted mailservers: mailcow, mailinabox, mailureddit.com
    review
  3. Mailcow vs Postal vs Stalwartmailflowauthority.com
    review
  4. Mailcow TCO vs $49 Managed (2026)justemails.app
    news
  5. Mailcow: My Self-Hosted Email Server vs Google Workspacewebnestify.cloud
    review
  6. Remote Code Execution in Mailcow (SonarSource)sonarsource.com
    security
  7. CVE-2026-40874: Auth Bypasssentinelone.com
    security
  8. Google Safe Browsing flags mailcow pagesgithub.com
    security
  9. mailcow: dockerized on GitHubgithub.com
    official
  10. Self-Hosting Email Servers (Privacy Guides)privacyguides.org
    review

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