Priority can’t be self-declared unless there’s an economic cost attached to it. FedEx envelopes cost a lot more than regular mail. People who classify an email

Priority can’t be self-declared unless there’s an economic cost attached to it. FedEx envelopes cost a lot more than regular mail. People who classify an email as high priority aren’t gaining much of an advantage as recipients are already jaded by people who mark every single outgoing email as high priority. Emergency vehicles can only make up a tiny fraction of total road traffic. Microsoft Windows and ISPs reset packet DSCP bits to 0, otherwise every program would request EF handling.