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.