This feature is enabled since 1.3.022302 version with Amavisd installed and activated
This feature is a kind of "duplicate" mails between servers with the same recipient domain.
 You wants to store mails to a local domain on a first server and at the same time, send the same mail trought a second server with the same recipient domain.
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- Go to your organization
- Click on Manager SMTP Domains icon
- Select a local domain you want to duplicate.
- If the feature is read, you will see a "Duplicate Domain" section
- Set the IP of the targeted server that will receive duplicated mails to this domain.
- After editing, the feature will be automatically apply to the server.




