I have a free Yahoo email account and someone accessed it last week without m,y permission and deleted all of my saved emails. I have emailed Yahoo customer service for help and gotten a few automated responses so far. I also visited their Help service while waiting to hear back from customer service. Basically Help says that once emails are deleted from my account and from my Trash they are deleted from their server and therefore GONE. Is this true? Don't they keep some kind of backup?

Second question: Can Yahoo research who has accessed my account and give me their IP address? Is something like this also possible and how hard is it to do?

Relying on their response via email , since they don't have a telephone number, is leaving me with a hopeless feeling. Hope you guys can help.