OS X :: Can't Send Email On Outgoing Mail Server

I'm having such a hard time syncing Gmail with Apple Mail now that I've done a fresh install of SL. First of all, in Gmail Settings, the instructions for setting up Apple Mail are for Apple Mail 3.0. But the Apple Mail with SL is 4.0. The instructions say to "Check the box next to Automatically set up your account." Pic of what I'm talking about: But my Apple Mail does not have that check box: Once it's setup it says it's supposed to look like this: Notice that it's POP and not IMAP? And in mine, once it's "automatically setup" it's IMAP and not POP: When I leave the settings as is, and try to send and receive mail I keep getting an error that says something like "Can't send mail on outgoing mail server". And when I change the outgoing server to POP I get the same error. I've tried everything, I've setup and deleted this e-mail account from Apple Mail at least 4 times now and I keep getting the same error.