I have a customer that has been using exchange for years and most of the time it works properly. One problem that they are having is people in their company don't always get new messages in their inbox.It appears that everything is OK except that a specific message wont come in. An email is sent from a person to 5 people, 2 in this company and 1 will get it and the other will not.
The other issue is nobody will get it in this company, however with a "Reply All" then all of the recipients will get it.
I have no idea how to troubleshoot this or where to begin. Any thoughts or suggestions would be most appreciated.