You have set up the cron job to send the actual mails (see installation instructions)??
Does Sendmail/qmail work? Can you send a mail from the command line using 'mail' or 'mutt' or whatever you have. Does Qmail work at all? (use /var/qmail/bin/qmail-inject to test)
Has the sendmail binary been linked to the qmail sendmail wrapper (normally lives at /var/qmail/bin/sendmail). If not anything could happen. Try setting sendmail path as /var/qmail/bin/sendmail instead.
Do you have an SMTP server somewhere that you can point at? If so try that instead.
General help
email is not working.
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