I have a Macbook Pro 2012 running Catalina 10. I am using the Apple Mail app. I was recently email hacked via the Yahoo account and had to reset everything. I have it all working on my iPhone and my iPad but it will "not authenticate" the Yahoo email on the Apple Mail on my MacBook Pro. I have Yahoo mail via my AT&T account and they had me switch passwords, shut down, clear cookies/cache....literally multiple times! NOTHING WORKS. It still fails to authenticate the Yahoo email. It downloads 3 other emails but not the Yahoo one. What do I need to do to get my email back into the email program? I can get it on a web server via AT&T but don't want it seperate and on a tab instead of via the mail program. THOUGHTS? What is the problem?