Setting up a cron job for auto archiving every hour cause (if you choose so in cron manager) sending 24 emails every day.
It would be nice having the possibility to choose to aggregate the output of many auto archiving jobs and send only one mail per day (or a period of time set by user); or/and to send an email only if the auto archiving job fails.
If you setup cron correctly it will by default only send emails when errors… make sure you have the > /dev/null