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How to Migrate Fastmail to Gmail? Step-By-Step Process

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Rollins Duke   Contributor
Published On January 5th, 2026 • 6 Min Read
Star Rating4.9based on 1207 user reviews

The process to migrate Fastmail to Gmail can be a challenging task for many users as it often causes lost old email messages or have issues with folder structures.

These issues typically arise from differences between how Fastmail and Gmail organize their emails and simply attempting to migrate them without taking these differences into consideration.

This guide provides you with a comprehensive understanding of how to safely import Fastmail to Gmail.

The guide contains step-by-step instructional directions to manually migrate Fastmail to Gmail, highlights the limitations of this method, as well as identifies when to use a professional solution to add Fastmail to Gmail, so you can be assured that you are migrating your data safely and without unnecessary efforts.

Why Do Users Import Fastmail to Gmail?

People migrate Fastmail to Gmail for various reasons. The majority of users choose to migrate for practical considerations:

  • Switch to Google Workspace professional account.
  • Enable easier collaboration through Google Workspace tools.
  • Provide improved search and spam filtering for Gmail.
  • Manage multiple service accounts through a single Google account

However, the biggest challenge in moving Fastmail to Gmail is accurate migration of data, rather than making the initial decision.

Fastmail Folders vs Gmail Labels

Fastmail folders are mapped to Gmail labels, but the difference between the two structures will lead to many issues when migrating Fastmail emails to Gmail. Here are a few examples:

  • A single Fastmail folder will map to one Gmail label.
  • An email can be represented by multiple Gmail labels.
  • Misinterpreted mapping of these two will create confusion or clutter.

Being aware of this can help you avoid a disorganized, chaotic Gmail Inbox after you complete your Fastmail to Gmail migration.

What Data Should Be Migrated

When completing to migrate Fastmail to Gmail, be certain to include:

  • Emails found in the Inbox.
  • Archived emails.
  • Sent Items and drafts.
  • Custom Folders.
  • Emails with attachments.

When you import Fastmail to Gmail, make sure all the important data is transferred.

Pre-Migration Checklist (Required for Accuracy)

Before you migrate Fastmail to Gmail:

  • Make sure IMAP is enabled in Fastmail.
  • Ensure you have enough Gmail space before you begin.
  • Delete unwanted emails/folders.
  • Use a proper internet connection.

How to Migrate Fastmail to Gmail Using IMAP? Manual Method

To import Fastmail to Gmail manually, you need to take the help of an email client like Outlook or Thunderbird. For that, we will configure both Fastmail and Gmail in an email client using IMAP. Follow this step-by-step process to import Fastmail to Gmail.

Import Fastmail to Gmail using Outlook or Thunderbird

To migrate Fastmail to Gmail, use an email application with IMAP (for example, Thunderbird/Outlook).

Set up manual connection between Fastmail and Gmail, please follow these steps.

1. Enable IMAP on Fastmail

  • Log in to the Fastmail WebApp.
  • Go to the settings page.
  • Verify that IMAP is enabled.

2. Prepare Gmail

  • Make sure Gmail has enough storage capacity for your Fastmail account.
  • Setup Gmail IMAP settings.

3. Connect Fastmail and Gmail Accounts to the Email Client by IMAP

  • Set up your Fastmail and Gmail account in your email application using IMAP credentials.

4. Give Time for Mailboxes to be Fully Synced

  • Wait until all folders from Fastmail are displayed in the client.
  • Depending on the total size of your mailbox, this may take some time.

5. Migrate Fastmail to Gmail

  • Select the mail folders or emails in your Fastmail account and drag them into their respective Gmail folders to upload them to your Gmail account.
  • Gmail will automatically convert the folders into labels.

6. Keep an Eye on Your Sync Progress

  • Leave your email application open.
  • Make sure that your computer doesn’t go to sleep or lose its connection.

Limitations of Manual Migration (Based on Real Use)

Manual methods to migrate Fastmail to Gmail can present problems like:

  • Gmail sync limits will stop migration.
  • Folder not transferred completely.
  • Duplicate email messages are created.
  • Lack of detail in reporting errors.
  • Consumes a lot of time to migrate large data.

These problems may not always present themselves until after the Fastmail to Gmail migration has taken place.

When Is Manual Migration Not Recommended?

There are many situations where using manual methods to import Fastmail to Gmail is highly risky:

  • Migrating Fastmail to Gmail with a large mailbox size.
  • If you need to migrate multiple Fastmail accounts to Gmail.
  • Migrating critical business or legal data.
  • When moving email folders without losing the structure.
  • If you need to add Fastmail to Gmail with selective data.

Is There a Safer Way to Migrate Fastmail Emails to Gmail?

Use of professional tools is usually much higher in both accuracy and reliability than manual IMAP migration methods.

Email Backup Software is a powerful dedicated tool designed to migrate Fastmail to Gmail. The software provides the most reliable method to forward Fastmail to Gmail without losing original folders structure and important email items such as attachments, sent/received items, headers, metadata, etc. Using the tool, you can directly establish a safe connection between Fastmail and Gmail and easily move all your data in bulk according to your needs. Try the free version of the software and test all its features.

select fastmail

Why the Tool Fit All Fastmail to Gmail Migration Scenarios?

If users wish to perform a Fastmail to Gmail migration in a more organized and secure way, the dedicated Fastmail to Gmail migrator is the best solution because it supports migrating Fastmail to Gmail without using email clients or continuous syncing processes.

From an operational standpoint, using the Fastmail migration tool offers the following advantages to users:

  • Avoids limitations of syncing to Gmail.
  • Minimizes the likelihood of a user missing or duplicating messages.
  • Enables users to successfully complete their migration without needing to leave their systems running for extended periods of time.

For users migrating their long-established business emails or long-term email accounts, this method offers them significantly greater assurance than methods involving manual processes.

Final Guidance

Overall, the process to migrate Fastmail to Gmail manually can be completed. However, as mailboxes continue to grow larger or become more complex, the risk of incorrectly importing Fastmail to Gmail increases significantly, along with the difficulty in correcting any structural issues later on, resulting in an inefficient and often incomplete process.

If emails carry substantial importance and the accuracy of their content is critical, you should consider a professional type solution, which allows for greater control over the entire process and will result in fewer errors during the Fastmail to Gmail migration process. Making an early choice on what method to use will allow for quicker completion, less work on your part and will potentially avoid major data loss later on.

Star Rating 4.9 based on 1207 user reviews
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By Rollins Duke

Rollins Duke is a content curator with a unique blend of technical expertise. Specializing in email migration, data backup, and conversion, He has a proven track record of simplifying complex processes. As a content creator, Rollins excels in presenting information in a clear and engaging manner.