I am unable to send emails due to ,”the connection to the outgoing server “Apple.stmp.mail.yahoo.com failed”! How do I fix this?

Hey there Eaglesvision,

While you may need to contact your email service provider about this, we were able to find the article that discusses the issue you described, along with the next steps to take for resolving it. It's the same one that's above your post: If you can’t send or receive email on your Mac

Cheers!