Our Exchange Org accepts emails for 5 different domain names (company1.com, company2.com, etc). Now, out of these 5 domains we sold 2 to a other company. On the closing day we are going to change external MX record to point to their mail GW.
Question - once we change external MX, if any one from our company sends an email to that 2 domains, it should route thru the VPN we already have with that company and hit their mail GW. What configuration should I change, such as deleting these two domains from Accepted Domains list or delete send connectors or creating internal MX record? Please help.