Will contact lenses melt if I use it while cooking/bbq ing? There is an email circulating saying so!

No. Heat hot enough to melt contact lenses would sear the eyelids, and damage the cornea.
If left on the grill. Contact lenses on the eyes won't melt during cooking or barbecuing (unless a cook has a severe or fatal accident in which his whole face is burned up). Cook's eyes don't get hot, and they automatically blink whenever hot air blows into their faces. A cook also knows not to have his face over a pot when he lifts the lid (avoid hot steam) nor too close to an oven door when he opens it (hot dry air).