IMAP server settings for Yahoo Mail. IMAP is the best way to connect your Yahoo Mail account to a desktop mail client or mobile app. It allows 2-way syncing, which means everything you do remotely is reflected in your Yahoo Mail account no matter where or how you access it. Troubleshoot email problems in Mail on Mac. Problems sending messages. If you can’t send emails. If people don’t receive emails you send. Problems receiving messages. If you can’t receive emails. If emails aren’t displayed or look strange. If junk mail filters aren’t working.
Good afternoon Colorful guy,
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Welcome to the Apple Support Communities!
I understand you are having issues with your Yahoo email account since updating to macOS High Sierra on your MacBook Pro.
Can you provide some additional information about your specific issue?
Are you able to send and receive messages from any other email service providers on your MacBook Pro?
If you can’t send or receive email on your Mac
Are you able to send and receive messages from your account on Yahoo's website (web based email)?
Has Yahoo made any changes to their email account settings?
Yahoo Help - Mail
Mail settings you might need from your email provider
If this is an IMAP email account, you may be able to delete the account from your MacBook and add it again.
Take care.
Yahoo Mail For Macbook Pro
Jul 6, 2018 4:40 PM