TL;DR To migrate business email without downtime, create identical mailboxes on the new host first, copy your existing mail across and lower your DNS TTL a few days ahead of time. Once ready, switch your MX records once, keep the old host active while DNS updates, and run a final sync to catch any late messages. KEY TAKEAWAYS Keep your old email hosting running until the MX change has fully propagated, and your final sync is done. Google allows up to 72 hours for MX changes to reflect. Lower the TTL on your MX records several days before the switch, so the new records take effect quickly once you make the change. Changing your MX records is the moment when the real changeover happens. Everything prior is preparation, and aft […]