Migrating email without downtime: how to do it
Afraid of missing email during a migration? With the right order you migrate without downtime. Here is the playbook.
The key: copy first, switch over second
Downtime happens when you flip your MX records before your new mailbox is ready. The trick is the order: first copy all your existing mail to the new provider while the old one keeps receiving.
Step by step without gaps
Copy your mailbox to the new provider. Only then switch the MX records to the new server. From that moment new mail arrives in the new mailbox.
Afterwards run one more sync to catch the messages that still landed on the old server during the DNS switch. That way you miss nothing.
Why migrating server-side helps
Because the copy runs on our servers and not in your browser, you can let it run while you keep working. No tab to keep open, and no risk that your connection interrupts the migration.