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When email deduplication is enabled, the journey checks the email addresses of the contacts in the segment (once they reach the email tile) and only send one email to each unique address. For example, if three contacts have the same email address, only one of them receives the email. The other two are reported as blocked under the Duplicate recipient address category in the Delivery and interaction details.
When email deduplication is disabled (default), the journey sends the email to every contact in the segment, even if they share an email address.
How to enable email deduplication
Go to Settings and select Feature switches.
Enable the Email deduplication feature toggle in the "Email sending" section.
How to view duplicated email addresses
You can view duplicated email addresses by going to your journey or email Delivery and interaction details.
When you view the insights, you see all duplicated email addresses in the blocked section under the Duplicate recipient address category.
Note
When an email is blocked due to duplication, the customer proceeds to the next step in the journey. If you want customers to exit a journey when duplication is detected, you can use the journey exit by trigger option. For the trigger, choose "Email blocked" and for the Reason, select contains the keyword "Duplicate." To learn more, see Exit when a trigger occurs.
Important
Email deduplication works on the email level, per journey. Email duplication isn't detected if you're:
- Sending the same email across multiple journeys. For each journey, the email is sent once.
- Sending the same email through different tiles in the same journey (for example, A/B testing, attribute branching, etc.). In this scenario, each email is considered unique, even if you send the same email.