I just got a letter (not email) dated 15/05/06 from International Lotto Commission - Loteria Primitiva. And guess what .. my 'lucky numbers' are 13-15-16-21-34-36. What a coincidence that they are the same as yours :);)
Mind you, mine only 'won' me 615,810.00 Euro.
These must be VERY lucky numbers, as googling reveals 376 web pages with emails claiming that these are the winning numbers. I'll have to put in a REAL lotto entry using them :)