what mailstat is

Jeff Grossman asked,

| What is the mailstat program?  What does it do?

Mailstat is a shell-and-awk script for summarizing the entries in your
procmail logfile.  It's described in the distribution documentation, but not,
as far as I know, in the manual pages, so if you're a user on a site where an
administrator has installed procmail, it's understandable that you might not
know of it.