I get Yahoo mail about 5 times each day it says up to 10 best Answers how do I stop this happening?

stop answering questions

You can't stop receiving best answer notifications. Read the disclaimer when you write answers. If you don't want them, I guess you could block the sender, and then you won't get them. You could also direct all the e-mails into a separate folder with a filter.

You can't. If you look a the note at the bottom of the boxes when you answer any question it tells you about the BA emails:

Note: If your answer is selected as a "Best Answer," you will automatically receive an email from Yahoo! Answers notifying you of this. You may not opt-out of receiving such emails.

I had that happen once, they listed all the correct answers I ever had

for several days, then it just stopped.

It seemed to had gotten stuck at one time and became repetitive.

Never happened again.

It will stop on its own.

In your profile you can check a box to make it so you don't get those emails anymore. Oh, and every time you ask a question, there are 2 boxes that you can either check or not, uncheck em and you won't get the emails.

You can't stop Yahoo! from sending mail to you.

When you play in their yard, you gotta play by their rules.

That part of the system cannot be turned off