Brand new to Mac and can't get the mail app working with my wife's Yahoo account. Everything seemed to set up automatically and easily. The app automatically chose a plus.pop.yahoo server to send and receive mail. However, the account is not working right. It only brings down an odd subset of the emails in the online version, with no rhyme or reason. I was also able to send an email as a test from the MacMail program, but the email only showed up in the online version and did not come back to MacMail. One other weird thing is that when I tried to delete the mailbox and start again, I could not get it to delete out of the list of mailboxes. The results I'm getting are so odd, it seems like something's broken. Advice?