You might have got this from a round-robin email: I’ve been sent it by K.
If you receive a card through your door from a company called PDS (Parcel Delivery Service) saying that they have a parcel awaiting delivery instructions and can you contact them on 0906 6611911 DO NOT call the number as this is a mail scam originating from Belize.
If you call the number and you start to hear a recorded message you will already have been billed Â£15 for the phone call.
If you do receive a card with these details, then please contact Royal Mail Fraud on 02072396655 or ICTIS at http://www.icstis.org.uk or your local trading standards office. This is a genuine scam.
Despite what the words “this is a genuine scam” normally imply, this is confirmed by Snopes. Caveat receptor!