I’ve had the same thing happen for my own personal domain that I run through Addy. Its frustrating because people can’t tell what a “good” domain is, so how can you have any rules about it? And if you do, then have a verification system with your customer service team.

But I’ve always said to myself, if this service won’t take my email then I don’t really want to be their customer. What else are they going to screw up when I give them my data?

I don’t know. I’m sure it only transmits when active, but that doesn’t mean its not collecting data at all times. If you’re on windows you can turn it off with a script, but it might turn back on after major updates.

Steam has telemetry. They gather a ton of data on you. What details, how they use it, and how secure it is I can’t answer, but it’s clear that it’s happening.