Staff Squared will send you daily email reminders about who is out of the office today and tomorrow. It can also send a notification about who's out to one of your Slack channels.
You can manage both the email and Slack notification settings from your Company Settings.
Firstly, on your Dashboard click on the Cog icon and then choose Company Settings.
Click on the Reminders tab and you will see Daily "Who's Out?" email
Here you can filter what information you receive, when you receive it and who should receive the daily summary. You can also turn on Slack integration just by clicking Add to Slack, and selecting the channel you wish Staff Squared to post messages to.
The notifications can be turned off for the whole company but not individual accounts.