Registered: 27/02/2003
Posts: 780
Loc: Washington, DC metro
My significant reduction in spam coincided with my beginning to delete it actively. Again, very small N. Perhaps my deleting a message aggregates in the decision to entirely block a sender. Who knows.
I've looked to see if I could discover how Google treats spam, but it seems an opaque process - entirely sensible if they don't want to arm the enemy.