Putting this here because when you search for this, this topic is at the top of my list.
under the options of “Global Filter Maps” after checking the ‘yes I understand doing this wrong is bad’ I then
I put in:
Header-From: Blacklist
/empty-env-from@localhost$/I
—
It worked for a while, and then didn’t, I’m trying to figure out why it no longer works. I’m going to add another line:
^[^@]+@localhost$
that basically is supposed to drop anything with that in it.