Here's an example crontab for use on systems that support /etc/cron.d style crontabs. See the packaging documentation for more details about incorporating a crontab into a package.
MAILTO="root" 30 2 * * * root /path/to/some/script MAILTO="joeuser@example.com" 5 * * * * nobody /path/to/other/script
Consult your system's cron documentation for further details.