I'm having problems with Mail on my iMac. AT&T (Bellsouth - Yahoo)is my server. I am unable to receive email using Mail. Until two days ago, it worked fine, for years, but since then, it keeps giving me an error message that my PW is incorrect. I havent changed my PW in years, so I know it isn't incorrect. Ive removed and re-installed my account information on Preferences several times, still doesn't work. Ive been on the telephone with Yahoo Tech Support, still doesn't work. Ive had my iMac to the Genius Bar at The Apple Store, still doesn't work. The Inbox on Mail shows a (~), I click on it to put all accounts on line, no change. Still doesn't work. I'm able to log onto my email account through the Yahoo Web Site, using my current PW, and it works, showing me all of my emails. No problems. Any ideas as to how I can get Mail to work? Would appreciate any help. Update May 21, 6pm: Late last night, I went to Mail, and found 17 emails waiting for me, and I thought the issue had resolved. Well, this afternoon, after opening Mail, here we go again.....an error message asking me for my PW over and over and over again. A (~) in my Inbox, and cannot receive any emails. What a joke! This is definitely a Yahoo issue! I cant say for sure whether this is a Yahoo issue with Apple Computer software or if Microsoft computers suffer the same problems with their email apps. But in the past few days, I have seen so many of the exact same complaints about Yahoo from Mail users here on this forum, it isn't just me.