Mail won't send after Lion upgrade and AT&T won't help
I upgraded my new MBP to Lion and now I can't send mail if I'm on my network at home. After looking at other threads (like this one: https://discussions.apple.com/thread/3192956) and based on the symptoms I'm having, I think the problem is likely an AT&T problem. When I use the Lion laptop on a different network, mail works and I can send mail with no problems. That suggests to me that the network is the issue.
I called AT&T to tell them this and they feel everything is working on their end so it must be my email client. They want to charge me to talk to tech support because I'm using an email client instead of their web interface.
Does anyone using AT&T have the same problem? Does anybody know how you get through to a big company like AT&T who isn't listening?
MacBook Pro, Mac OS X (10.7), 2.2 Ghz Intel Core i7