When people mention this service and I notice their website says there is a free version, I try to create an account and can’t see any free version. So it appears to me their is something unsavory about their service and I can’t test the Exchange server setup myself. Do you know how to get a free account as advertised on their website banner ads?
Their help says they do have autodiscovery and 24/7 help.
https://www.memail.com/support/guides
What does their personal help say when you complain about it not working?
Bill