Hi. I want to migrate my Exchange 2016 server with SolidCP to a new 2019 server. I recall that there was some type of rule or loopback, I don't recall for sure that we had to do to the Exchange server to allow email to flow between domains on the same server. I just can't seem to find the documentation on it. Does anyone know what has to be done? Also, is there anything I need to do in SolidCP besides create a new Server in SolidCP as well as install SolidCP on the Windows 2019 Server and configure the Exchange settings for Exchange 2019 server in SolidCP, as well as delete out the old server. 

Thanks a lot!