Hi! I own a MacBook Pro running on Mac OS X 10.7.3, running Mail 5.2. The problem is that despite many desperate attempts, I am unable to set up any mail accounts on my system. The error says the mail server is not responding(on all mail accounts, say gmail or hotmail). I also want to mention that I'm accessing the web through a proxy server, which, as far as I think is not a problem, since in the diagnostics, it says that mail was able to connect to the internet. Please help!