I launched Exchange 2016 for the company.
The problem I have now is that computers that are in the domain can easily connect to Exchange via Outlook, but computers that are in the network but are not domain domains can not be connected to their account with Outlook.
The same problem exists for mobile devices.
On the other hand, I gave Exchange a policy to send emails with the name of another domain I have on the Internet.
Thank you very much for guiding me to resolve this issue