If your email is important and you can’t afford the downtime during the migration of your email service from one provider to another provider – how?
During migration, your new DNS may not respond immediately due to the DNS propagation. This problem can be solved by setting up the new DNS server to have the Zone records as the old one.
With such setup, your email could be pointing to both new or old email server during the propagation. This is fine as long as the email doesn’t get lost. You can retrieve emails from the old server later.
Once the propagation process is over, you can update the Mail Exchange (MX) to activate the new email service. MX update takes place almost immediately. Now, all email will go to the new email server.
Apart from this, you have to pre-configure the new email server to have exactly the same user account as the old one.
Zero-downtime migration for email is possible!