This is very odd. I thought the "mark as spam" button was entirely within Gmail. I had no idea it sent a message to the email sender. Is this standard? It seems counter productive, since it confirms the spam was received. I want it to fail silently and disappear forever.
What should I be doing, to achieve silent spam disposal within Gmail?
I hope I don't have to set filters myself, that would defeat the entire purpose of a smart system that learns to recognise spam.
Edit: we're talking about "mark as spam", not "unsubscribe", right?