How to get rid of pop up advertisements on my email account?

There is a pop up advertisement on the right side of the email in AT%26amp;T account, you click to close, when you open the next email it opens again. Very annoying. I want to delete it for good....

How to get rid of pop up advertisements on my email account?
We can't get rid of them unless you subscribe to Yahoo Mail Plus, it has no ads. The ads pay Yahoo to be here. So we get Yahoo free. Even ad blockers don't work that well.

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