When good installs go bad

http://www.mail-archive.com/ubuntu-bugs@lists.ubuntu.com/msg34933.html

dpkg --remove
dpkg --purge

then reinstall

Converting from mbox to mailman

http://www.pocock.com.au/linux-doc/mbox-maildir.html

install mb2md

mb2md -m
mb2md -s mail

do something with ~/mail and /var/spool/mail/$USER

/etc/postfix/main.cf
home_mailbox = Maildir/
mailbox_command = procmail -a "$EXTENSION" DEFAULT=$HOME/Maildir/ MAILDIR=$HOME/Maildir

Tweak procmail filters, can use .target/ for destinations

/etc/dovecot/dovecot.conf
default_mail_env = maildir:~/Maildir