Outbox vs. USPS: How the Post Office Killed Digital Mail 
“You mentioned making the service better for our customers; but the American citizens aren’t our customers—about 400 junk mailers are our customers.  Your service hurts our ability to serve those customers.”The article blows right past this like it's insignificant. Junk mailers sort their own mail, drop ship it to the local BMC, and pay the post office for the privilege. This subsidizes the regular mail. If you can get rid of junk mail with a mouse click, it's not worth it.The post office getting upset about ways to prevent junk mail from being delivered is just like a website complaining about Adblock.