On my "iMac" I can receive email but can't send from it. I'm using the email that came with the computer. It was fine last Wednesday, then started refusing to send the emails. Then it was fine on Thursday afternoon, but stopped sending again on Thursday evening. The error coming up says the server cannot connect. I contacted the server company and they tell me it's a MAC/Apple problem. I contacted MAC/Apple and they told me it's the server problem. Strange thing is, that everything works fine when I use the PC for emails. Both are hardwired from a "D-Link". Suggestions?