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Import MBOX to Cyrus Server Account (Step-by-Step Guide)

  Mark Regan
Mark Regan
Published: April 28th, 2026 • 5 Min Read

Overview: The process to import MBOX into Cyrus IMAP mail account can be done manually using an intermediate email client (eg, Thunderbird) at a user level or using the “deliver” command if you are dealing on the server end. An enterprise-grade approach to bulk transfer MBOX to Cyrus server account is using BitRecover MBOX to Cyrus import tool – for bulk data handling with precision.

Table of Content Hide
  1. Reasons for importing data
  2. User-level method using Thunderbird
  3. Server configuration details
  4. Verification process
  5. Admin-level server method
  6. Professional solution approach
  7. Restore using the pro tool steps
  8. Comparison of methods
  9. Final support information

Cyrus is a popular, well-known email server used by thousands of universities, businesses & enterprises for their email communication. It offers you custom domain-name email addresses, such as [email protected]. Often handled by IT admins.

Cyrus servers store GBs of email data in a secure & unique format (not an MBOX file), which is why it can be tricky to import MBOX into a Cyrus account. Here we have laid out step-by-step instructions to do so. Based on your needs and demands.

Why Import MBOX File into Cyrus Mail Account?

There can be many reasons for adding MBOX email data to the Cyrus mail server, such as:

  • Restoring Bulk Backup
  • Centralize Company Email Data (on a secure cloud server)
  • When migrating from one IMAP service to a Cyrus server.

Method 1: User Level MBOX to Cyrus Import via Thunderbird

Note: Both Admin (via permission) & user-level Cyrus mailboxes can be accessed using Mozilla Thunderbird. However, the server admin account, made to manage mailboxes, cannot be configured or used by Thunderbird.

Disclaimer: This method will only work for small-scale MBOX data on a user level due to Thunderbird’s limit and has a risk of data loss.

Here are the steps to follow to import MBOX emails in a Cyrus server account:

  1. Download Mozilla Thunderbird on your desktop.
  2. Enter your Full Name and Cyrus email ID.
  3. Choose IMAP as the configuration type and enter the Cyrus server details mentioned if the auto fetch fails. (Mentioned Below Steps)
  4. Test the connection.
  5. Go to Menu >> Themes & extension.
  6. Search for ImportExport NG tool and Add.
  7. Go to Local Folder, right-click, and choose ImportExport NG Tools.
  8. Choose Import MBOX >> Import MBOX from a Directory.
  9. Browse the MBOX folder on your PC and import.
  10. Right-click on the folder and choose Move To or Copy To.
  11. Select the Cyrus Mail account in Thunderbird as the destination.
Settings IMAP (Incoming Mail) SMTP (Outgoing Mail)
Server Address (Based on Domain) imap.yourdomain.com smtp.yourdomain.com
Port 993 587 (or 465)
Security SSL/TLS STARTTLS (or SSL/TLS)
Username email address email address
Password Email account password Email account password

Verification: After the import is completed, you can verify the import by accessing your Cyrus Mail account in webmail or another email client like Outlook.

Method 2: Server Admin Level Approach to Import MBOX to Cyrus

Important: These steps are not for a user-level account but for server admins only. An admin account can directly make changes to any user’s mailbox. Since the changes are made directly onto the server, steps must be followed carefully.

  1. Open PowerShell or Terminal.
  2. Get the server access: ssh admin@yourserver (enter your server).
  3. Upload MBOX: scp file.mbox admin@server:/tmp/ (file.mbox – name of the MBOX field imported in the Cyrus Mailbox server).
  4. Access the Cyrus admin tool: cyradm --user admin localhost (admin is the admin username here).
  5. Check the mailbox: lm user/name-of-user-mailbox
  6. Import MBOX to an Account on Cyrus server: cat /tmp/user.mbox | /usr/cyrus/bin/deliver -u name-of-user-mailbox

Although the way is reliable for handling bulk, it is not feasible for every user.

Enterprise-Grade Solution to Import MBOX to Cyrus Mail Account

BitRecover MBOX Converter for Cyrus Mailboxes is the expert-recommended GUI-based professional solution to add bulk MBOX data to a Cyrus mail server account with ease. Due to its advanced features, such as:

  • No restriction on the number of files or mailbox size to be imported into the Cyrus account.
  • Highly secure and compliant with HIPAA, CAPA & GDPR.
  • Filter options to selectively import MBOX emails to the Cyrus account based on date range, sender & receiver mail address, and keywords.
  • Preview MBOX folder mode with detailed log report generation after import.

Install the BitRecover MBOX to Cyrus Mail Import Tool Today. Free Trial Available to Transfer 25 MBOX emails per folder to Cyrus Server Account.

How to Restore MBOX Backup to Cyrus Mailbox? Using Pro Tool

  1. Download the tool on your PC.
    MBOX Backup to Cyrus Mailbox Using Tool
  2. Select your MBOX files or folder.
    Add MBOX files to Cyrus Import Tool
  3. Preview and select the MBOX emails folder.
  4. Choose IMAP from the saving option.
    saving Option for MBOX to Cyrus Import
  5. Enter your account details. (Mentioned above)
  6. Press Convert to start the import.

Choose the Best Way to Upload MBOX to Cyrus Account

Feature Mozilla Thunderbird deliver-Command BitRecover
Bulk Data Handling Limited to 4GB Max Supports bulk migration Unlimited bulk migration
Ease of Use Requires setup & add-ons Requires IT/admin knowledge No technical knowledge required
Data Preservation Risk of data loss during sync Accurate Fully Preserved
Time Taken Slow (based on IMAP sync) Fast Significantly Reduce Downtime

Need Help

Need help with importing MBOX files to Cyrus server accounts, or want to request a specific feature for your business or enterprise need? Get in touch with BitRecover experts for support available via Live Chat 24/7 globally.


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