Help - Strange Problem with Yahoo email on my 3G iphone

When I send email from my yahoo account - very often the recipient gets multiple copies - sometimes as many as 5 copies. Sometimes they only get one copy. But usually they get multiple copies. I have been to the ATT store a few times trying to get this cleared up but no one can figure out why this happens and what to do about it.
Does anyone else have this problem.
Does anyone know why and what to do?

Using the email validation tool, did you get any errors?
When you install the Yahoo account to your Q10, it accepts your email address and password and sets up the account?
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