No clarification on who these qualified senders are? Not even a hint..? Why not all domains?
One downside of opening this is that you'd let spammers easily figure out if their spam is being so detected.
But I would venture a guess that it's been in the works for a while.
You hear that recruiters? When you say you've removed me from your systems and then 3 weeks later I get another non relevant spammy job offer you always end up in my spam.
I practice "Inbox Zero Tolerance".
No clarification on who these qualified senders are? Not even a hint..? Why not all domains?