Getting leads through EDDM

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A friend of mine does co-op mailers on these giant postcards using every door direct mail from the United States Postal Service. It’s spray and pray marketing but I can get into 10, 000 mailboxes for 7 cents each. Do you guys have any experience in this area? Buying ads in co-op mailers - UNTARGETED (except zip code and postal route). Interested to hear your thoughts.