By default, your users can subscribe to a daily digest and receive all unread microposts once a day.
In the Confluence administration you can configure the daily digest under Microblog →Mail Notification.
You can disable or enable the daily digest.
You can set a default time for the digest to be sent (your users will be able to override this time).
There is a scheduled job for sending out the microblog daily digest.
It runs every hour (the same interval the users can choose) and sends an email to every user who configured this hour to receive their digest.
You can disable the job or change the interval, but then your users won't get their information at their chosen time.
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