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How to Transfer Zimbra to Mailcow With Complete Guide?

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Published By Jamie Kaler
Rollins Duke
Approved By Rollins Duke
Published On May 28th, 2026
Reading Time 5 Minutes Reading
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Summary: Looking forward to transfer Zimbra to Mailcow open-source server to cut down organization costing or switching to new technology. This, blog guide explain you the clear step-by-step method to migrate Zimbra to Mailcow both using the programmatic script based and automated tool based methods.

As people know, Zimbra is a very popular email collaboration platform. They also offer the users advanced features such as calendars, emails, and contacts for your business. On the other side, Mailcow is an open-source email server known for its flexibility, modern user interface, and amazing security. Most of the users prefer to transfer Zimbra to Mailcow because it provides great performance to the people.

Reasons Why People Choose to Transfer Zimbra to Mailcow

  • For a business that deals with emails and mailing. Mailcow comes equipped with a colorful and easy-to-navigate interface.
  • It offers several security features, such as SSL/TLS encryption, making your data more secure.
  • Zimbra is closed-source, while Mailcow being open-source means users will have more control and customization ability than with Zimbra.
  • It is usually cheaper to run or maintain as compare to Zimbra and Mailcow is best suitable choice for small and medium level organizations.
  • Mailcow offers faster response times and faster performance, which boosts email productivity.
  • Thanks to its user-friendly interface and tools, managing users, domains, and mail accounts is quite easy.

Zimbra vs Mailcow

Feature Zimbra Mailcow
Development Model Closed-source Open-source (offers more control and customization)
Interface Not specified Modern, colorful, and easy-to-navigate
Security Not specified Enhanced with SSL/TLS encryption
Maintenance Cost Not specified Generally cheaper for small to medium enterprises
Administration Not specified Simplified management for users, domains, and mail accounts
Performance Not specified Provides faster response times and higher efficiency

Manual Solution to Migrate Zimbra to Mailcow

Follow these four manual steps to transfer Zimbra to Mailcow:

Step1: Backup Data on Zimbra

  1. Create a backup copy of Zimbra mailbox data.
  2. Repeat for all account as you want to proceed in migration.
    zmmailbox -z -m <user@example.com> getRestURL '/?fmt=tgz' > /backup/path/user@example.com.tgz

Step2: Extract Zimbra Backup Data

  1. Keep the backup files in your local environment.
  2. Extract the .tgz files in order to get the email data in .eml format
    tar: tar -xvzf user@example.com.tgz

Step3: Set Up the Mailcow Server

  1. Read Mailcow’s official setup guide, install and configure it based on target server.
  2. Check the exact same account and domains in Mailcow admin interface that existed in Zimbra.

Step4: Import Emails to Mailcow

  1. Use an IMAP migration tool like IMAP sync to transfer emails from Zimbra to Mailcow:
    imapsync --host1 zimbra.example.com --user1 user@example.com --password1 'password'.
    --host2 mailcow.example.com --user2 user@example.com --password2 'password'
  2. Follow the same process for all email accounts available, and check all the email accounts frequently.

Note: Afterward, reset the Mailcow webmail password to ensure all emails, folders, and data properly transferred and test for email delivery and relay. Finally change the DNS settings, MX records according to Mailcow server, allow some delay for DNS changes to take effect.

Drawbacks of  The Manual Method

  • This approach requires commands and scripts, which is not performable for common users.
  • It requires lots of time especially when dealing with large volume of data.
  • This manual approach is complicated and prone to mistakes and it can affect partial transfers or permanent data loss.
  • It is not necessarily perfect for copying and pasting; for example, calendars or your contacts might not be moved perfectly.
  • Technical support is unavailable if something goes wrong during the process.

Automated Solution to Transfer Zimbra to Mailcow

Use the MailsWare Zimbra Converter Tool and quickly migrate Zimbra to Mailcow hassle-free. The trusted brand offers professional software and also gives you advanced features such as batch conversion. Also, you can easily convert Zimbra to PDF, EML, HTML, and more (20+ saving options). Non-technical users can also use this software without any trouble.

Download Now Purchase Now

Steps to Transfer Zimbra Emails to Mailcow

  1. Download and run Zimbra to Mailcow Migration Tool on your machine.
    launch Zimbra to Mailcow Migration tool
  2. Secondly, choose the ‘Select Files’ or ‘Select Folders’ option.
    Browse Zimbra TGZ file
  3. Thirdly, preview Zimbra data and select as you wish to migrate.
    view Zimbra data
  4. Then, choose IMAP in the list of select saving options.
    select IMAP as saving options
  5. After that, enter your Mailcow email and password to login.
  6. Hit the next button to start transfer Zimbra emails to Mailcow.

Benefits of Automated Solution to Transfer Zimbra to Mailcow

  • It allows to directly migrate Zimbra files in batch to save time and effort.
  • This software guarantees that it will preserve all information without any errors or mistakes.
  • The tool used in this process doesn’t require technical skills, and anyone can use this tool easily.
  • This software also allows you to preview your Zimbra content before performing the migration.
  • It offers user-friendly interface to make it reliable for both professional and common users.

Conclusion

Let’s conclude this article as we have shared both manual and automated approaches to easily migrate Zimbra to Mailcow. If you are technical, then you can perform it manually. For easier and batch migration, we recommend you choose Zimbra to MailCow Migration as it is reliable for 100% accuracy and no input. You can also compare Zimbra vs Mailcow to know the benefits of migration and easily perform the whole migration without requiring any technical expert. If you have any queries, then you can connect with our Support Team, as they are available 24/7 to assist you.

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