If you are not able to see your emails and when you click on a particular email, some errors appear like ServerError, ComposeFailed, MessageTooLarge, TooManyCallsBatched, Yahoo Error 4 etc., you don’t have to worry about it.
You can fix this issue without facing any difficulty-
Relay access denied is not a wise operation, and then you are likely to get ‘electronic mail issue’. These are the possible causes of Yahoo mail error 4-
• Connection closed
• Email sync is turned off
• User unknown
YOU JUST HAVE TO FOLLOW THESE STEPS TO RESOLVE THIS ISSUE:
Step 1- Sign out your Yahoo Mail account from all the connected devices.
Step 2- You have to clear your Web browser’s cache.
Step 3- You have to restart your Web browser.
Step 4- Sign in your Yahoo Mail again.