Mailer is chewing up inodes like candy

Mail seems to be the cause of the first machine crash which chain-reactioned.
Too many tiny little mail files and dirs.  So until someone can install an
ancient mailer, we're going to have to do without mail.  Hopefully this will
only be about 24 hours.
Depends on how quickly someone goes about installing an ancient mailer.
Or rewrite the current one.

Rust