I've had emails sent to gmail users from our paid MS Exchange accounts blackholed. And not just randomly once or twice. My wife was a contractor for someone and

I've had emails sent to gmail users from our paid MS Exchange accounts blackholed. And not just randomly once or twice. My wife was a contractor for someone and despite having years of previous conversations with them, one day they just stopped getting her emails altogether. She had to create a gmail account just to keep working with them.