Prepare the destination and recovery option
Back up the current service and inventory accounts, aliases, forwarding and folders. Create the destination mailboxes and test access before changing MX. Check storage capacity and verify that exports can be read back.
Switch new delivery deliberately
Copy old messages using a supported migration method. Apply DNS changes, test externally and keep the old service running for cached or delayed delivery. Update every device. Cancel the former service only after validating folders, messages and new delivery.
Your practical checklist
- Make a readable backup.
- Check storage and addresses.
- Test the new mailbox first.
- Temporarily retain old access.
A useful question
Does a domain transfer handle this?
No. A registrar transfer does not migrate existing mailbox contents.
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Sources & further reading
Original guide by chname.ch editorial. Archive dates organise this library; this guide was created and reviewed on . Provider and registry instructions take precedence when requirements change.