Re:Yahoo Triples Estimate of Breached Accounts to 3B
by konschubert on Tuesday October 03, 2017 @09:27PM
(#15397633)
I think that marking the mail as spam sends a signal to their email provider, putting a mark on their account?
At which point you should wind up in the "how widely can I advertise that you're a spammer and all your outbound email should all be routed straight to /dev/null for sending mail to an email address you were never given" filter.