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I have one that has me stumped. A new customer has a DC and an Exchange 2016 server. Everything has been working fine until yesterday. Something happened and the server now will not let any of the Outlook clients connect. I can connect through OWA but I cannot send or receive emails. When trying to send, I get the You don't have permission to perform this action. Everything looks normal in the EAC. In the Event logs I am getting the 9041 which from reading on it points to DNS but the only DNS entry in the NIC configuration is the DC. Needless to say the customer is anxious to get email back up. Any ideas?
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I have one that has me stumped. A new customer has a DC and an Exchange 2016 server. Everything has been working fine until yesterday. Something happened and the server now will not let any of the Outlook clients connect. I can connect through OWA but I cannot send or receive emails. When trying to send, I get the You don't have permission to perform this action. Everything looks normal in the EAC. In the Event logs I am getting the 9041 which from reading on it points to DNS but the only DNS entry in the NIC configuration is the DC. Needless to say the customer is anxious to get email back up. Any ideas?

Exchange 2016 Outlook clients will not connect and there's not inbound/outbound email

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

Microsoft Outlook is a personal information manager from Microsoft, available as a part of the Microsoft Office suite. Although often used mainly as an email application, it also includes a calendar, task manager, contact manager, note-taker, journal, and web browser.

Outlook

The Domain Name System (DNS) is a hierarchical, globally distributed system responsible for associating the name of a computer, service or other resource into an IP address for connecting to the Internet or a private network. Most prominently, it translates domain names to the numerical IP addresses needed for the purpose of computer services and devices worldwide.