That's an option. Haven't needed this before because I just block addresses that I receive spam on. I've always just accepted every email sent that wasn't addre

That's an option. Haven't needed this before because I just block addresses that I receive spam on. I've always just accepted every email sent that wasn't addressed to a blacklisted address, so people can't really misconfigure anything, I'll always get their email without hoops to jump. So far, the spam has been very limited, but maybe one day I'll need to do this. Or block Microsoft IPs and tell them they can sign up for my IP reputation management system that sends out emails with broken confirmation links... I haven't yet decided.