FWIW, as a UK Amazon buyer with a Visa Credit card, I received an email this morning with Subject line "Visa credit cards will not be accepted, starting 19 Jan, 2022" and nothing but my name in the body. A very, very basic email - interesting 'From' address though.
Received: from a0-156.smtp-out.eu-west-1.amazonses.com (a0-156.smtp-out.eu-west-1.amazonses.com [54.240.0.156])
From: "Amazon.co.uk"
Subject: Visa credit cards will not be accepted, starting 19 Jan, 2022
Date: Wed, 17 Nov 2021 09:15:34 +0000
Content-Type: text/plain; charset=utf-8
Amazon.co.uk
Please note that this e-mail is being sent from an e-mail address that cannot receive e-mails. If you have any questions and wish to contact us, click here:
https://www.amazon.co.uk/gp/help/customer/display.html?
2021 Amazon.co.uk is a trading name for Amazon EU Sarl, for Amazon Media EU and for Amazon Services Europe Sarl, all of which have their registered office at 38 avenue John F. Kennedy, L-1855 Luxembourg.