Spam through the Letterbox

I hate Christmas, all I seem to do is clean spam out of my letterbox daily. all most hourly, rather excessive I would say, such a waste of natural resources, and who really reads them, If I want something their is online shopping if i must so I can browse at leisure, or the old fashioned way, go look in the shops,I am tired of the spam, and paying for extra rubbish bags to dump the stuff