Yes alle the user are having problems.
Its a small company < 10 they have changed from provider. the email domain is still the same. also they used to work as a workgroup but now are in a domain environment. all user where POP clients and want to move to exchange,
I just installed a new server all went well except exchange.
also in other question I asked about MX records and DNS.
I`m not shure if it has something to do with the configuration or DNS
All clients can sent email but can not receive email.