Welcome to the #dominoforever Product Ideas Forum! The place where you can submit product ideas and enhancement request. We encourage you to participate by voting on, commenting on, and creating new ideas. All new ideas will be evaluated by HCL Product Management & Engineering teams, and the next steps will be communicated. While not all submitted ideas will be executed upon, community feedback will play a key role in influencing which ideas are and when they will be implemented.
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Deduplication already exists :
e.g. create a new mail, put "UserA@domino.com" into the SendTo field and into the copyto field, then refresh the screen (View/refresh) and the address is removed from the CopyTo field.
In the case you described above, you are receiving an email with the same name in To and CopyTo. When replying to an email like this the names will be deduplicated when refreshing (View/refresh)