Yahhoooooooooooooooo

UURrrrrrrggghhhhhh, I just discovered that my yahoo is eating my emails! ggrrrr, how annoying! It is deleting emails after I read them, who gave it permission? certainly not me! I have had this email for over 5 years, the last thing I want to do is change it, so it better start behaving soon or...... gmail here I come