Im running a windows 2016 domain. top level internal domain is example.com and so is external domain (where website is hosted). this is not a good practice but it is what it is. I could add a sub domain but not sure on how to reconfigure and move all clients. I added a www A record with the ip so no issues getting to public website but recently (last month), local clients are not receiving email (pop) but can send. If i connect to the domain via VPN, my own email (pop) does not work for any of my email accounts (different domains). If i disconnect from VPN, works good again. I had planned on setting up a sub domain to separate internal from external but never had the opportunity. Maybe now is the time? What i dont understand is why this is happening suddenly with no changes that i am aware of. seems like a MX record issue or something. I added a mail.example.com A record with the IP assuming this would resolve but no joy. Some assistance/ guidance would be greatly appreciated.