We are using exchange 2013 for the email solution and we are still using Exchange 2007 in the edge environment only for mail flow. Since we are using Edge server only for mail flow, spam filtering and other scanning we are using cloud product. Since we are using Edge 2007 only for mail flow, we are planning to remove the edge servers for mail flow.
What are the best solution in this case if i need to remove Edge servers and what are the steps needed for successful mail flow after edge 2007 removal?