
Quote from Ticketwatcher:
I remember someone raising this issue last fall on the Quotetracker forums which no longer exists ironically because of its deal with Ameritrade. Ameritrade said they dealt with the problem as soon as they found out about it. I doubt that. As I remember the poster who I assume was trading for a living had an email account dedicated to each of his brokers. The only party which had the address was his broker and that is how he immediately knew that his email information had been shared or hacked. He had contacted Ameritrade immediately but had gotten no satisfaction.