The update module can send you email when a new release is available for a module you installed. The problem is I get a email everyday. Some security update are very minor and unreachable for an attacker, I don't want to update the website and so I don't want future notification about this update.
I would like to be notified every time their is an new update, not every day for the sames updates.
update_requirements()
and_update_cron_notify()
at least by the looks of things). It would be much easier to ignore the emails and check the site manually on a schedule that suits your workflow