Temporary Error 3
Occasionally, an issue may occur in Yahoo Mail resulting in "Temporary Error 3." Don’t worry, this error will usually correct itself within a few minutes to a few hours.
Fixing the error
Signing out of, then signing back in to Yahoo Mail will usually correct this problem.
Still having problems?
Using a desktop or laptop, please submit a request for assistance to Yahoo Customer Care, with a description of the error you're seeing.