Fix the Cut-n-paste...
It absolutely painful to attempt to paste text into the body of an email or into the email TO line. The suggestions to be sure the blinking cursor is where you want the text does not work. The text is always placed at the top of the email. Pasting email addresses provides the same frustrating experience.
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A T commented
THis happens to me as well. Absolutely awful to deal with. I am planning to stop using Yahoo Mail if this is not fixed. I cannot get anything done quickly any more.