I hope it is a way to solve this…
It's a rare treat to see somebody raise a concern while at the same time doing something (PR + discussion). Kudos to you!
I've seen other similar lists with the same issues (c7 I think?).
This is going to be a mesh if all private email providers are blocked.
It is logical that large corporations that base their economy on surveillance advertising hate users who protect their privacy by using all kinds of dirty tricks to bypass or eliminate these protections.. Luckily I have had no problems so far with the Proton, Tuta and Murena (NextCloud) emails that I use.in the EU.
Unfortunately? This is true. That’s why I asked help from community!
Try with Murena, the NextCloud mail (xxxx@e_email direction), it's maybe less known by these lists.
I saw the other day Tuta complaining that Outlook has been sending emails from tutanota.com straight to junk/spam. What’s surprising is tuta.com emails were fine. So not sure if their domain change had anything to do with it, or if MS is doing the same thing as in the OP.
Look. Outlook, Yahoo, ICloud, even Gmail provides temp mails solutions, but nobody complains or blocks them.
Also you can use something like this that will create disposable Gmail every time. So blocking Proton is totally useless