You have probably seen in the media that scam e-mails are being sent out which if your not very careful result in your bank account being emptied.
These e-mails are reportedly very sophisticated in as much that they look like the genuine article. Check all received messages and then re-check before opening. In one instance only one letter had been altered in the senders e-mail address but the recipient missed it and had thousands of pounds removed. Be careful out there.