Yahoo Mail Gets Stuck in Outbook on MacBook Pro

Hi momneedstechsupport,

Thanks for getting back to us!

What we'd like to do is test this behavior in an alternate user. Follow the steps outlined at Set up users, guests, and groups on Mac to set up a new Administrator user. Once that's done, log out of your normal user account and into the new. 

Set up your mail account in this alternate user and let us know if the problem still persists.

We look forward to hearing back from you!

Hello Momneedstechsupport,

We understand that you're having trouble getting Yahoo-based mail to send from your MacBook. We recommend reviewing the following for some things that can impact sending mail:

If you can’t send emails in Mail on Mac - Apple Support

Additionally, you can use this site to verify the settings to use: Mail Settings Lookup

Thanks for using Apple Support Communities!

Thanks for getting back with us, Momneedstechsupport,

Given that this is also failing to work in an alternate user, this would suggest that there's an issue within the settings for your mail account. To ensure that you have the correct ones, we would recommend reaching out to Yahoo support at this point to verify those settings.

Thanks for using Apple Support Communities!