"Postal workers would contact police if a return address was given, New Zealand Post spokesman Ian Long told Reuters, adding it was illegal to post objectionable material. "When somebody comes across it, it's going to be smelly. It might smell somebody else's mail and then there's just the nature of it -- if it actually bursts and starts contaminating other people's mail. It's not a very nice thing at all," he said."

"The Rural News newspaper launched the 'Raise a Stink' campaign this month after the government said it would levy farmers to help pay for research into livestock emissions of methane and nitrous oxide. The gases account for more than half the country's greenhouse emissions."