Capital One, MasterCard or VISA will never send you an email asking for confidential information like your card number, PIN or security details. If you receive anything asking for these details, please don't respond, even if the email claims your account will otherwise be closed.
If you're not sure about an email that claims to be from us, instead of clicking on links, type www.capitalone.co.uk directly into your browser. This applies to any email you've got doubts about - just shut it down and log-on to the organisation's website directly.
If you think you've received a hoax email, please forward it to abuse@capitalone.com