Yahoo mail with Mac Mail
Had to change my email..using my Yahoo email. Yahoo won't save my password..changed it multiple times..Why? How can I fix this? IOS Catalina
iMac 21.5″, macOS 10.15
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Yahoo App password…
Generate and manage third-party app passwords
Some older, third-party email apps (that do not use our Yahoo branded sign in page) require you to enter a single password for login credentials. To access your Yahoo Mail account on these apps, you'll need to generate and use an app password. An app password is a long, randomly generated code that gives a non-Yahoo app permission to access your Yahoo account. You’ll only need to provide this code once to sign in to your third-party email app.
https://help.yahoo.com/kb/access-yahoo-mail-third-party-apps-sln15241.html