It's not just about being common, it's also about the share of abuse coming from such domains.
Or just incompetence, I had to lobby to get .org unblocked for mail at some CS faculty of a (not my) university, 20 years ago.
alt Hacker News
Or just incompetence, I had to lobby to get .org unblocked for mail at some CS faculty of a (not my) university, 20 years ago.