I Have Access to Bank Accounts That Are Not Mine (Capital One Bank)

Looks like it was a case of mistaken identity. One party named the OP with power of attorney, mistakenly thinking of someone else with the same name. What bothers me is how that is possible, don’t you need SSN, address, signature, something more than a name to do that?

On a somewhat related note, my name is Aaron Aardvark, my email address is aaron.aardvark@gmail.com. I've been getting emails from some bank I am not a member of because an Aaron Bernoulli registered an account with my email address, and the physical address he listed is, as best as I can tell, some abandoned lot. I've just been autofiltering all the emails to spam because my one attempt to notify the bank about it got nowhere, and they don't provide an unsubscribe button. Do I have any other responsibility here?

I once had an unexpected deposit show up in one of my IRA brokerage accounts. Given the size of the amount, it must've been a transfer. Anyway, I called up the broker and they said they would figure it out, just don't touch the money. It took a good 3 or 4 months, but it was eventually reversed.