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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Maybe existing third party solutions already fit better for this purpose than a comprehensive implementation of such a feature into the product.
This is shipped in Notes v12. Please refer to this documentation: https://help.hcltechsw.com/notes/12.0.0/client/wn_override_default_sign.html
Having more options for signatures is a good idea, but I think I mis the option where notes is not sending a signature to internal emails.