Now we're all used to phishing emails, online fraudsters are trying a new tactic. If you get an email from someone saying they've received a message from your bank by mistake with instructions how to sort it out, just delete the email. Don't be tempted to reply and tell the fraudster what you think of them, that just confirms your valid email address!
Don't forget, a bank should never ask you for your password or online login details. If they do, change bank.