I need some help. I don't know where to start. I am having some major Exchange issues where users are intermittently not receiving their e-mail. I attempted to replicate the problem and have seemed to do so. I sent myself an email using hotmail and yahoo. I recieved the hotmail but not the yahoo. I have rebooted the server to rule out a hung application and did not see any errors or warnings in my even log that could suggest a malfunctioning service. It is quite baffling. The queses are not filled nor do they have anything in them. Our spam box is not receiving the missing mail either. Please help.