I had this same issue. I installed it, looked at the content of this file, and assumed that "default" meant "default". I was only able to fix the situation after changing "CRON_DAILY_RUN" to "true" as described, and I also set "CRON_DB_UPDATE" to "true". This is a bug, as no rational person with any experience would read this as requiring "true" to be added for the cron job to run. There's a discussion about this here as well. Wasted more time than makes me happy before I figured this out.
http://askubuntu.com/questions/382992/rkhunter-sends-no-email -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1011151 Title: Wording of /etc/default/rkhunter To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/rkhunter/+bug/1011151/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs