A client has two separate companies each with a unique email domain. One has been moved to Exchange, the other is still on a GMail hosted domain while we prepare to cut them over. The company on GMail can send messages to the company on Exchange, but the company on Exchange cannot send email to the company on GMail. I take it that, because of the domain conflict, the Exchange server attempts to send these messages to the unused Exchange accounts instead of their GMail accounts.
So my question is, is there a way we can temporarily disable the domain for the company that is using GMail until we are ready to change them over, so that emails sent to their domain will route externally to GMail instead of filling up the inboxes of unused accounts? Thanks for your help.