If you're seeing the same person queued to receive a flow multiple times, they may have taken the trigger action multiple times. For example, someone could have made multiple purchases in a row or viewed multiple products in the same browsing session.
Smart Sending, when left enabled, will ensure nobody receives more than one email in the established Smart Sending period (16 hours by default). We highly recommend keeping Smart Sending enabled when your flow is triggered by commonly repeated behavior, like viewing a product or being active on site.
Use Additional Filters to Limit Email Frequency
If you want to disable Smart Sending for a flow email and are concerned about multiple emails sending to someone in a short period of time, you can also add an Additional Filter to your email that limits how frequently someone can receive an email from the flow.
Make sure to replace INSERT_EMAIL'S_SUBJECT with the actual subject line of the email, and X with the number of days for the period of time you want to prevent users from receiving the email a second time.
Use Flow Filters to Limit Email Frequency
Alternatively, you can also add a filter to the entire flow to limit how frequently someone will enter it. To achieve this, add the following Flow Filter:
Has not been in this flow > Skip anyone who has been in this flow in the last ___ days
Make sure to replace this ___ with the number of days for the period of time you want to prevent customers from re-entering the flow.