I had a different problem. On my wife's account she started receiving someone else's emails. Initially we suspected that her email was wrongly(typo) used in registration at various sites. But increasingly we noticed that the conversations in the mails were ongoing, implying continued usage of her address. We suspected her email was hacked and changed password, that didnt help. Eventually she had to abandon that email. The problem with free mail service is that the support you get is what you pay for.