I suddenly started getting Amazon verification requests for every email I send via PushToKindle!
I’m aware that this is not a new topic and has been discussed here, on reddit and elsewhere. Many people propose to try different email addresses. I changed my addresses (device, sender) multiple times to always completely distinct ones, usually containing characters and numbers. But to no avail! I still get the verification request every time! This is very annoying because I’m a “power” Push-To-Kindle user and this really destroys my user experience!
What I found interesting is the fact that the Push-To-Kindle browser plugin always after the sending shows "Sent to firstname.lastname@example.org! The “free” is different to what the Amazon kindle page wants as domain which only is “kindle.com”! Maybe that this creates the problem (although it worked for years)?