HCL Domino Ideas Portal
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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From my experience: If you add field named MailAddress (containing the forwarding address) to mail-in database document that it should work just like for the person document.
Remark: A Mail-in database is supposed to be a destination. If you like to have a routing entry then you could create a person document for the same address.