How do I report to Yahoo that my account has been hacked?

The other day I tried checking my email and wasn't able to access my account. I tried retrieving my password by answering the secret questions, but I know for sure that those weren't secret questions chosen by me. My sister (whose account I am using...

My sister's yahoo and friendster account was hacked. We don't know who and how it was possible for someone to gain access to her account even if she just open it at our home. Is it possible to trace the hacker ? How can we report it? Can we still retrieve...

someone is using my email account to send messages to everyon on my contact list. i assume a virus. how do i report this and get it stopped?

MY ACCOUNT WAS HACKED BY SOMEONE AND I CAN'T ACCESS IT ANYMORE! I ALSO TRIED TO CHANGE PASSWORD BUT THE SUPPORTING QUESTIONS THAT WAS BEING ASK WAS CHANGED.

i cannot access my e-mail account already after somebdy hacked it that is why i want to delete it

It was recently hacked and spammed to all in my mailing list. How embarrassing

I received 8-9 undeliverable emails at 3:44 am. I had not sent anything to anyone on the list that it showed. How can I find out what was sent and by whom?

Someone hacked into my yahoo account and changed my password and "secret question and answer". I use this e-mail address for all personal and business contacts, and therefore need to keep this address. Yahoo's TOS states that you have to report...

My Yahoo mail account has been hacked by someone from overseas (UK I think) and is now flooding my alternate account with threatening email using my own (hacked) yahoo account. I can no longer access the account but am working with Yahoo to regain control...