We’ve introduce Sending Limits to help you better control the number of emails a user receives in a specified time-interval.
From Users -> Limits you can set these limits like the following:
Campaign Types Limits
For campaign types (transactional, recurring and newsletter) you can set the maximum number of emails received in one day. A day is considered from 00.00 to 23.59 in shop timezone.
On the right side you have all the tags added. For each tag you can enter the number of days a user will not receive another email with the same tag.
Click here to see how you can add tags to campaigns.