“Communication limits” can be used to prevent crowding end-user inboxes with multiple emails coming from different journeys, reducing marketing fatigue and unsubscribes.
Go to Settings > Communication Limits. Click on “Edit” at the top right corner. Set the Toggle to active next to the “Global Communication Limits”

Choose which kind of limits you want to set. You can set Daily Limits, Weekly Limits or both.
Click save. Communication limits are now enabled. Customers will not receive emails if they exceed Daily OR Weekly limits.
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Limits are applied on a rolling window from the time of sending. For example, if an email is sent at 09:00 AM on Monday, 17th Feb:
Emails sent between 09:00 AM Sunday, 16th Feb → 9:00 AM Monday, 17th Feb are considered for Daily limits
Emails sent between 9:00 AM Monday, 10th Feb → 9:00 AM Monday, 17th Feb are considered for Weekly Limits
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You can override communication limits at 3 levels.

Click on the “Email Settings” on the top right

In the Settings panel, navigate to “Email Delivery Control” section at the bottom
Set the toggle to active, next to “Ignore Send Limits”
On the Left panel, go to “Email Delivery Control” section at the bottom

Set the toggle to active next to “Ignore Send Limits”