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I have a client who wants to migrate their business email to my SmarterMail system. No problem. Except, when the name servers are changed - the old email won't be available anymore. And if I set up the client on my server without changing the MX records at the very least - then the new email won't work.
So how do I have a business in both places at the same time - just long enough to migrate their emails to my server?