Now they are getting over zealous.
I was getting Netflix spam using *****@xtra.co.nz so I was marking those as spam via the webserver. But was never receiving spam for my genuine Netflix membership email address.
But now xtra is marking those as spam as well. Hoping the "Not Spam" works. But I would not be surprised if I start receiving spam again for my non genuine email address.
You cann't win.
How do you know that? IIRC we dont see what they filtered, so we dont see false positives