"... Those companies have Combined Mail Agreements with the post office, as well as some expensive equipment — think $700,000 to $800,000 for a special optical reader machine for starters. Basically, they “work share” with the postal service. By taking over some mail pickup and sorting services “the post office bypasses three or four procedures at significant labor savings to them, which allows us to offer the permitted discounts,” Cline explained...." 
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