"There have been hundreds of Madeleine theories, sighting and tips sent in from members of the public. But this one is different. It's incredibly detailed and so far, from the inquiries being made in Portugal, it appears to be based on factual events. This could be very significant." - a police source told the News Of The World.
It is thought the maid is Portuguese and that she was sacked and left the complex on "bad terms".
The email, which is believed to have been prompted by the Prince's backing for Kate and Gerry McCann, was immediately reported to Scotland Yard who contacted Portuguese detectives working on the case. Link