This likely violates some combination of state and federal laws around electronic delivery of written receipts by seller to buyer; Washington state law expressly defines a ‘delivered’ written communication to have exited electronic systems under the sender’s control, and nothing about this email qualifies as ‘lists the exact items sold and exact prices paid’. Assuming someone does their due diligence on UCC, US, and Washington & California law, I suspect Amazon has years of liability exposure to a class-action suit seeking recompense (written receipts provided by email) and damages (to ensure future compliance by Amazon & others) on behalf of every U.S. Amazon customer for acting with express intentions to violate such theorized ‘purchase receipt delivered in writing’ laws. Further research required, and I hope someone ends up doing it!

Amazon has created an interesting conundrum with this move, your purchase information should be private as should any communication sent to your email and there should be much greater awareness of companies mining your private communications for their own use...