If you send an email to a recipient whose email account is hosted by Microsoft, or you share you email address with such entities, you are part of the problem.
I refuse to be part of the problem. So before contacting a recipient (gov agencies in particular), I do an MX lookup on their email address. It almost always points to MS servers.
So snail mail it is. Otherwise sending them email serves as a signal to the recipient that MS is okay for email.
I’m working on a ECI (a sort of petition at EU level), the scope is the Fediverse, however, after that step I’m sure we can push for other changes as well. I totally agree with you but the change has to come from us.
Glad to hear you can help drive that from the EU side. Until then, I will continue sending paper correspondence. It would help if more people would insist on paper correspondence to create a bit of motivation.