You can use a mail flow rule to restrict sending, the downside is that you have to periodically enable/disable the rule. A method that allows you to automat this part is described in this article: https://practical365.com/right-to-disconnect-implementing-a-timed-disclaimer-in-exchange-online-with-azure-automation/
how do i configure users to send emails at a specific period of time
Phrancis Mkamanga
0
Reputation points
i have a company and i want certain employees to be sending emails to an email group at a specific time period, for instance, during working hours, 8AM to 3PM. email can bounce back with a response to only send during working hours.