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It has been a problem for a couple of days, and at this point Yahoo is well aware of it. Unfortunately for people who use Yahoo email, the company itself issued a statement that said this was caused by a hardware issue that is more difficult to resolve than they anticipated. I’m sure it will be sorted out before long, but you might be out of luck for a little longer. On the upside, apparently the emails that were received during the outage weren’t all lost, so there is a good chance you will get any messages that you missed, just a little later than usual.