I am having considerable problems sending emails using Entourage. The error messages vary but it basically is telling me that the administrator does not recognize the address even though I have no problems sending them a message on a PC compatible computer. Further, if it is a reply to a message sent to me, it gives me a similar error message. Does anyone know what is causing this problem. I would like to use this program as it appears to have a lot of nice features, but until I solve this email problem, I'm stuck.