My list of list of list inclusion trumps your second order list. I use my work emails sometimes for conference registrations, those always get burned and I get spam mail immediately. Conf registrations are the worst.
I sometimes do the same. It's weird to me that some places immediately sell your email and other orgs do not. Like a graph database conference seemed to lead to a lot of new spam.
It’s not some conference, it’s some asshole who has the ability to implement that kind of behaviour. I bet loads of people working at that graph conference didn’t agree but either didn’t know or didn’t have a say in the activity.
Not an RFC standard but it is a "de facto" standard. Everyone implements it, the config line for it is just commented out on postfix, super easy to use.
Maybe it's too early, but I don't get it. If the spammer doesn't strip "+<secretKey>" then you get spam in your real inbox. Btw, what is so secret about the secretKey if you post it on the internet?