Hi, Do you have multiple contacts using the same email address? According to our team's testing, if there are two or more contacts using the same email address, when a Marketing Email is sent using the Customer Journey, the email address will receive multiple emails.
Additionally, if you are sure that your contacts are using different email addresses, there may be an issue with the product itself and you can use the link below to seek support from Microsoft. https://admin.powerplatform.microsoft.com/support I hope my answer is helpful to you! If you have any other questions, please feel free to contact me. Best Regards, Rudy Zhang
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