The standard functionality built in means you can manage the space watchers and they will get an update every time the space is updated
https://confluence.atlassian.com/display/DOC/Watching+a+Space
or if you'd prefer, the recommended email is weekly
https://confluence.atlassian.com/display/DOC/Configuring+the+Recommended+Updates+Email+Notification
But that's all there is as part of the core service. You could write a user macro that gave you the last 7 days of updates if you wanted but it would just be in a page and not emailed out automatically, although could always script that externally with something liek curl.
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