When I was a grad student, I participated in a bunch of conferences, and sent papers to journals and the like.
But now I'm no longer in academia. I've been out for more than three years, and I still get a few emails a week notifying me of new conferences, hotel discounts for those who register, extended deadlines and the other usual stuff.
The thing is that none of these emails offer contact information or ways to unsubscribe from the mailing list. And it's not like they're from organizations I previously interacted with, but they are certainly about my former line of research. They are probably worse than spam, because I don't even think you could report them as spam.
I removed myself from all site registrations I can remember, such as IEEE and ACM, but these keep coming and coming and coming and coming.
How can a former academic get himself removed from all these mailing lists?