🚀 go-pugleaf

A few mailing lists I've been on have had filters that automatically added
"Precedence: bulk" to every message. This is Very Useful.

If a system has a large, clogged mail queue, it might be Very Useful
to be able to push a message to an administrator to the top of the list.

Precedence: (not Priority:) headers are a good thing and should be kept
around. In fact, they should be used more.

All the canned Sendmail configurations have a dinky little list of only
three or four priorities. Smail 3.1 comes with five. I wouldn't mind
seeing more Sendmail people adding all of these to their configurations.
Smail 3.1 associates each grade with a single character, similar to UUCP
grades, but they should by easily translatable into Sendmail numbers.

9	special-delivery
A	air-mail
C	first-class
a	bulk
n	junk