I hate it when I do that. I was trying to say that when we send mail to a student we get an NDR saying that the e-mail account does not exist at the organization this message was sent to. The alias file is on the SMTP gateway. This is a Sun box running send mail. Our old Exchange 5.5 server had the same problem for a while but we manager to make it send everything to the Sunbox. How can I either make this thing send mail through the gateway or is there another problem.