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I have my laptop and my desktop connected to one cable internet connection through a router/switch. I can download emails from either computer. I can send from the dsktop, but I can't send from the laptop. I get error messages that say the server is not responding or the connection was unexpectedly terminated. The only reason I can think of why it would matter which computer is sending the mail at all is the MAC address. Do emails contain that information? If so, maybe the mail server sees it and won't take it because they don't want you to have more than one computer on your connection. Could it be anyting else and does anyone know how I can fix it?