Which version of Acrobat are you using? I just tried to Acrobat DC, and I am getting the same error. I do remember reporting a problem with Yahoo to Adobe a while ago, but don't know if it was the same. I don't use Yahoo email on a regular basis.
Go to Preferences (Ctrl+K) > select Email Accounts > Add your yahoo account and click on Make Default.
Now click on email icon > Attach to Email > Choose Default email application (Microsoft Outlook) and continue.
First of all the above make your Outlook profile and sent it your document through Microsoft outlook.
It really work for me.