Issues setting up email on MacBook Air
How do I get my email set up on my new MacBook Air. It won't take my password for the email. I have 3 email accounts and was successful in setting up 2 of them.
MacBook Air 13″, macOS 10.13
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Apple's guidance: Add an email account to Mail on your Mac - Apple Support
On the one where you can't set up, can you access the website using the credentials you're using locally? If so, you need to go through the process for the beginning after removing the "bad" account. Something in the data is preventing it from working.
If not, there is a problem with the email service itself. Yahoo or whoever.
Maybe a temporary "authentication" type password required by the mail service?