There are quite a few third-party applications like Outlook or Mac Mail, that will be making use of the IMAP or POP settings to connect to the Yahoo Mail account. There are different possibilities as to why the Yahoo Mail settings are not working on the email client.We will now be looking at some methods to troubleshoot the Yahoo mail settings not working problem and make sure Yahoo mail settings start working again.
You need to verify if you have entered the proper email settings for both the Incoming mail server and Outgoing mail servers.
Incoming Mail Server (IMAP)
Outgoing Mail Server (SMTP)
Make sure you remove any untrusted third-party application you have installed on your computer. Now, the Yahoo mail settings not working issue should be fixed.