Postfix, like sendmail, has a few setgid programs for manipulating it's
queue.  The group is normally "postdrop", but we're using "maildrop"
both in the tree and pkgsrc.  I'm not sure why; possibly because it
changed at some point or because its what sendmail users?

Anyway, I asked Wietse Venema about changing one of the includes so that
we could override the default ... "over my dead body...".

So, does anyone mind if I add a "postdrop" group?