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Head-to-head · Mail Server Software

Zimbra Collaboration vs mailcow

  • Updated Oct 2026
  • Both researched from official sources
  • 1 check side by side
Higher score Zimbra Collaboration #2 in Mail Server Software 9.1/10 Free plan Free plan✓ 0 of 5 features Visit Zimbra
mailcow #7 in Mail Server Software 8.5/10 Free plan Free plan✓ 0 of 5 features Visit mailcow

Zimbra Collaboration leads on 0 checks, mailcow on 0, and 1 is even. Who comes out ahead on the 1 yes/no, price and count check where we have data for both products. The editor score weighs everything else too.

Our verdict

  • Highest scoreZimbra Collaboration · 9.1/10
  • Free planboth

Zimbra Collaboration scores higher on our rubric for mail server software: 9.1 against 8.5 out of 10; our editors rank them #2 and #7.

Zimbra Collaboration is the better fit for full-featured open-source collaboration mail. mailcow is the better fit for docker-based mail and groupware deployments.

  • Zimbra Collaboration fits best

    Full-featured open-source collaboration mail

  • mailcow fits best

    Docker-based mail and groupware deployments

Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.

Side by side

Feature Zimbra Collaboration 9.1/10 Visit ↗ mailcow 8.5/10 Visit ↗
At a glance
Editor score 9.1 8.5
Ranking #2 in Mail Server Software #7 in Mail Server Software
Best for Full-featured open-source collaboration mail Docker-based mail and groupware deployments
Pricing model Free Free
Starting price Free plan Free plan
Free plan ✓ ✓
Free trial — —
Deployment Cloud, Self-hosted, Desktop, Mobile Self-hosted, Cloud
Platforms Web, Windows, macOS, Linux, iOS, Android Web, Linux
Support Email, Phone, Tickets, Community, Docs · 24/7 Community, Docs, Email
Compliance SSO/SAML, 2FA 2FA
Integrations 5 integrations 5 integrations
Built for Small business, Mid-market, Enterprise Solo, Small business, Mid-market, Enterprise
Features Zimbra Collaboration 0/5 · mailcow 0/5
Webmail interface Not checked yet Not checked yet
IMAP/POP3 access Not checked yet Not checked yet
Mobile sync Not checked yet Not checked yet
Antispam tools Not checked yet Not checked yet
High availability Not checked yet Not checked yet
Specs
License model Not checked yet Not checked yet
Mailbox limit Not checked yet Not checked yet
Our review
Pros
  • Combines email, calendars, contacts, tasks, and file sharing
  • Supports IMAP, POP, SMTP, CalDAV, CardDAV, and ActiveSync
  • Includes migration, security, backup, and restore capabilities
  • Includes Dovecot, SOGo, Rspamd, ClamAV and MariaDB components
  • Supports TOTP, YubiKey OTP and WebAuthn two-factor authentication
  • Provides mailbox migration tools and configurable message limits
Cons
  • Commercial licensing uses quote-based pricing
  • Hosted storage and attachment limits depend on the hosting provider
  • Its broad feature set may exceed basic email-only requirements
  • Requires self-hosted infrastructure and administrator-managed operations
  • Its platform model is limited to self-hosted deployments
  • The component-rich stack requires familiarity with mail infrastructure
Our verdict

Zimbra Collaboration is an open-source email and collaboration suite from Synacor for businesses, educational institutions, service providers, and organizations that need control over deployment and data. It combines email, contacts,…

Read the review →

mailcow: dockerized is an open-source email and groupware suite packaged with Docker. It is intended for individuals, small businesses and organizations that want to manage their own email infrastructure rather than subscribe to a…

Read the review →
  1. Zimbra CollaborationMail Server Software 9.1Free plan
  2. mailcowMail Server Software 8.5Free plan

Strengths and trade-offs

  • Zimbra Collaboration — where it wins

    • Combines email, calendars, contacts, tasks, and file sharing
    • Supports IMAP, POP, SMTP, CalDAV, CardDAV, and ActiveSync
    • Includes migration, security, backup, and restore capabilities

    Where it doesn't

    • Commercial licensing uses quote-based pricing
    • Hosted storage and attachment limits depend on the hosting provider
    • Its broad feature set may exceed basic email-only requirements

  • mailcow — where it wins

    • Includes Dovecot, SOGo, Rspamd, ClamAV and MariaDB components
    • Supports TOTP, YubiKey OTP and WebAuthn two-factor authentication
    • Provides mailbox migration tools and configurable message limits

    Where it doesn't

    • Requires self-hosted infrastructure and administrator-managed operations
    • Its platform model is limited to self-hosted deployments
    • The component-rich stack requires familiarity with mail infrastructure
  • Zimbra Collaboration9.1/10 · Free plan

    A broad open-source suite for organizations that need email, collaboration, and deployment control.

    Visit ZimbraFull verdict →
  • mailcow8.5/10 · Free plan

    A Dockerized mail and groupware suite for teams managing their own infrastructure.

    Visit mailcowFull verdict →

More comparisons

All mail server software comparisons → · Full ranking →

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Last updated · How we research and update