You’ve found a better host: better pricing, better support, better uptime. 

But one thought keeps you from pulling the trigger: years of client emails, contracts, and invoices sitting in your current inbox, and the fear of losing them mid-move. 

You can migrate business email to a new host in South Africa without losing a single message, as long as you follow the right order of steps.

This guide walks through exactly how to do that. 

From the prep work that protects you before anything changes, through the actual switch, to the mistakes that catch people out most often.

Before You Migrate: What to Prepare

A clean migration is decided before you touch a single setting. Get these three things sorted first, and the actual switch becomes far less stressful.

Back Up Every Mailbox First

Export a full copy of every mailbox before you begin, regardless of how the migration itself will run. 

Most email clients let you export to a standard format like MBOX or PST, and your current host may offer a built-in export tool too.

This backup is your safety net. Even a well-planned migration can hit a snag, and having a local copy means nothing is ever truly at risk.

List Every Email Account and Alias You Use

Write down every mailbox, alias, and forwarding rule tied to your domain. 

It’s easy to remember the main accounts and forget the alias your accountant uses, or the forwarder that quietly sends invoices to a second inbox.

Recreating this list from memory after the migration is far harder than checking it off before you start.

Lower Your DNS TTL in Advance

Your domain’s DNS records include a Time to Live value, which controls how long changes take to spread across the internet. 

A day or two before migrating, lower this TTL to something short, such as 300 seconds.

This one step means that when you do switch your MX records, the change propagates in minutes rather than up to 48 hours, cutting your exposure window dramatically.

How to Migrate Your Business Email Without Losing Messages

With prep done, the migration itself follows a clear sequence. Skipping the order here is where most message loss actually happens.

Set Up Mailboxes on the New Host First

Create every mailbox and alias on your new host before changing anything on the old one. 

Match the exact addresses you listed earlier, so nothing arrives with nowhere to go once the mail starts flowing to the new server.

Transfer Existing Emails via IMAP

With both the old and new mailboxes active, use an IMAP transfer tool to copy existing emails across while your old host is still receiving mail. 

This keeps both inboxes live and in sync during the move, rather than forcing a hard cutover.

Large mailboxes can take hours to transfer fully, so start this well before you plan to switch your MX records, not on the same day.

Most modern hosts, including Truehost, provide a transfer tool inside the mailbox settings rather than requiring separate desktop software. 

If your new host doesn’t offer one, free tools like imapsync run from the command line and handle folder structure, read status, and attachments faithfully. 

Though they take more technical comfort to set up than a built-in option.

Update MX Records to Point to the New Host

Once your new mailboxes hold a full copy of your existing emails, update your domain’s MX records to point to the new host.

This is the step that actually redirects incoming mail, so only make this change once you’re confident the new setup is ready to receive it.

Verify Mail Flow Before Cancelling the Old Host

Send test emails to and from your new mailboxes, and confirm they arrive properly on both desktop and mobile. 

Keep your old hosting account active for one to two weeks after switching, since some senders and old distribution lists can take time to catch up with the change.

Check that outbound mail authenticates correctly, too, not just inbound delivery.

Send a test email to a Gmail address and check it lands in the inbox rather than spam. 

This confirms your new host’s SPF and DKIM records are configured and passed before you rely on them fully.

Common Migration Mistakes to Avoid

• Cancelling the old host immediately after switching MX records, before confirming mail flow is stable

• Skipping a full backup and relying only on the transfer tool to catch everything

• Changing MX records before the new mailboxes are fully set up and tested

• Migrating during a business-critical week, rather than a quieter period with room for troubleshooting

• Forgetting to update email addresses saved in third-party tools, like invoicing software or CRM integrations, that send on your behalf

The Easier Way: Built-In Migration Tools

Manual IMAP transfers work with any host, but they’re not the only option if you’re moving to Truehost Business Email specifically. 

The Truehost portal includes a built-in migration tool that handles the Gmail import for you directly from your account settings.

After logging into your Truehost Business Email portal, you’ll find a Migrate Emails option under settings. 

Selecting Gmail as the source and authorising access lets Truehost pull your existing emails across automatically, with the option to import in batches for larger mailboxes. 

It’s worth confirming your new mailbox has enough storage allocated before a large import, and expecting the process to take longer with a bigger inbox history.

This built-in tool removes the manual IMAP setup entirely for Gmail migrations, which matters if you’d rather not configure transfer software yourself.

Frequently Asked Questions

1) How long does an email migration take?

A small mailbox can transfer in under an hour. Larger mailboxes with years of history can take several hours to a full day. MX record propagation adds anywhere from a few minutes to 48 hours on top of that, depending on your DNS TTL setting.

2) Will I lose emails during the switch?

Not if you follow the backup-first, IMAP-sync approach outlined above. The biggest risk comes from changing MX records before the transfer finishes, or from skipping the backup step entirely.

3) Should I migrate during a quiet period?

Yes. Avoid migrating during your busiest week, a product launch, or any period where a delayed email would cause real problems. A quieter few days give you room to troubleshoot without added pressure.

Make the Switch With Confidence

Migrating business email doesn’t have to mean risking your message history. 

Back up first, transfer while both accounts stay live, and only cut over once you’ve verified everything works.

If you’re moving to Truehost Business Email, the built-in migration tool handles most of the heavy lifting for Gmail accounts, so you can make the switch without losing a single conversation.