How to prevent sending duplicate emails to the same email address
If you have several recipients with the same email address in your database, you can merge duplicates and avoid sending emails to the same email address. Use the [Prevent to send duplicated emails to recipients with the same address] system setting for this purpose. If the system setting is enabled and the email audience has several contacts with the same email address, Creatio will send a single email to one of these contacts, selected at random. The email response of the rest of the contacts with the same email address will be “Canceled (Duplicate email)”. The recipient is selected randomly.
To prevent Creatio from sending duplicate marketing emails:
1.Go to the system designer by clicking 
in the top right corner of the application window and click [System settings].
2.Open the “Prevent to send duplicated emails to recipients with the same address” (PreventDuplicatesSending) system setting and select the [Default value] checkbox on the opened page.
3.Save the changes.
As a result, Creatio will search for duplicate email addresses before sending emails. If it detects the same email address for several contacts, the email will be sent to only one of them.
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