This is my first question in here. Please help. One of my user is not getting NDR form an External wrong email address. I test that email address from a different account and getting NDR says incorrect email address. So the remote server is sending NDR and my server is getting that. It is happening last 4-5 weeks. Affected user is not getting any NDN. I checked the user outlook settings no rule is configured.
Any help will be much appreciated.