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What happens when you access Yahoo Mail on Safari ? Are you getting any errors ?
Do you have another browser ? Like Chrome or Firefox ?
First we can reset Safari and see if it works or not. Open Safari. Click on Safari menu at top left and select Clear History and Website Data. On the dropdown next to Clear, select All History and click Clear History.
Can you access Yahoo now ?
This is not an issue with Safari. It is an issue with Yahoo. Can you reset the password ***** ?