If you get error code 475 in your Yahoo mail, then don't worry, here I am sharing all the steps which you can take to fix Yahoo mail error code 475.
1. FIrst of all, Sign out from your Yahoo account and then again login.
2. Whenever you start getting such an error, make sure to wait for some time before trying to send an email again.
3. Delete all emails from the Outbox folder.
4. Change the password of your Yahoo account.
5. If the problem is still there then you can also contact Yahoo help page.