So when a spammer is using one of my domain email addresses to send me their spam, and that spam isn't caught by Sonic's spam filters, I generally use the User Tools "no valid email address" alias, so that it disappears into a black hole.
Recently, I've been put on some far-right email lists (all using the same email address I provided to some unrelated third party long ago). I've tried their "opt-out" link (hey, why not try, sometimes it works), but I just keep getting them, of course.
I was wondering - what would happen if instead of the black hole, I had the email tool forward the email back to the spammer? Would this cause undue load on Sonic's email servers, possibly causing a vicious loop of back-and-forth between Sonic and the spammer's email server?