Does anyone know if yahoo has an investigation team that I can foward the suspicious emails which are being...?

Sent from my account. The last 20 people I've sent messages to have already gotten three emails coming from my account which discuss business propositions. I really want this to stop and I was hoping if there were some place I could forward these messages to. I know that aol has a team set up for dealing with problems like this but this is my yahoo email address were talking about